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Rounding GCSE Questions PDF
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This revision resource contains lots of practice rounding to a given level of accuracy, including rounding: decimals to the nearest integer, to the nearest ten, hundred and thousand, 1, 2 and 3 decimal places and 1 significant figure. Questions are abstract or based on real-life scenarios such as speeds, populations, etc.
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Bounds ( AQA GCSE Maths )
Revision note.
Bounds & Error Intervals
What are bounds.
- It simply means how low or high the number could have been before it was rounded
How do we find bounds when a number has been rounded?
- UPPER BOUND – To find the upper bound add on half the degree of accuracy
- LOWER BOUND – To find the lower bound take off half the degree of accuracy
- ERROR INTERVAL: LB ≤ x < UB
- the upper bound is the cut off point for the greatest value that the number could have been rounded from but will not actually round to the number itself
- The degree of accuracy is 10 (rounding to 3 s.f. here requires rounding to the nearest ten)
- Half the degree of accuracy is 5
How do we find bounds when a number has been truncated?
- This means that the UPPER BOUND is found by adding 1 to the digit in the place value that the number was truncated to
- The LOWER BOUND is always the number the value was truncated to
- For example, the error interval for the number 1230, truncated to 3 significant figures will be 1230 ≤ x < 1240
Worked example
The degree of accuracy is 1 decimal place, or 0.1 km so the true value could be up to 0.05 km above or below this
Upper bound:
3.6 + 0.05 = 3.65 km
Lower bound:
3.6 - 0.05 = 3.55 km
Upper bound: 3.65 km Lower bound: 3.55 km
Calculations using Bounds
How do i find the bounds of a calculation.
- The upper bound of T can be found by adding together the upper bound of a and the upper bound of b
- The lower bound of T can be found by adding together the lower bound of a and the lower bound of b
- The upper bound of T can be found by using the upper bound of a and subtracting the lower bound of b
- The lower bound of T can be found by using the lower bound of a and subtracting the upper bound of b
- The upper bound of T can be found by multiplying together the upper bound of a and the upper bound of b
- The lower bound of T can be found by multiplying together the lower bound of a and the lower bound of b
- The upper bound of T can be found by using the upper bound of a and dividing it by the lower bound of b
- The lower bound of T can be found by using the lower bound of a and dividing it by the upper bound of b
How can bounds help with calculations?
- You can use bounds to calculate the level of accuracy of a calculation
- e.g. If the lower bound of an value is 8.33217... and the upper bound is 8.33198...
- The true value is between 8.33217... and 8.33198...
- Both bounds round to 8.332 to 4sf
- To 5sf they differ (first is 8.3322 and second is 8.3320)
- Therefore you know the answer is definitely rounds to 8.332 to 4 significant figures
(a) A room measures 4 m by 7 m, where each measurement is made to the nearest metre
Find the upper and lower bounds for the area of the room
Find the bounds for each dimension, you could write these as error intervals, or just write down the upper and lower bounds As they have been rounded to the nearest metre, the true values could be up to 0.5 m bigger or smaller
Calculating the lower bound of the area, using the two smallest measurements
3.5 × 6.5 =
Lower Bound = 22.75 m 2
Calculating the upper bound of the area, using the two largest measurements
4.5 × 7.5 =
Upper Bound = 33.75 m 2
(b) David is trying to work out how many slabs he needs to buy in order to lay a garden path.
Slabs are 50 cm long, measured to the nearest 10 cm.
The length of the path is 6 m, measured to the nearest 10 cm.
Find the maximum number of slabs David will need to buy.
Find the bounds for each measurement, you could write these as error intervals, or just write down the upper and lower bounds As they have been rounded to the nearest 10 cm, the true values could be up to 5 cm bigger or smaller
We have a mixture of centimetres and metres, so it is useful to change them both to metres for later calculations
The maximum number of slabs needed will be when the path is as long as possible (6.05 m), and the slabs are as short as possible (0.45 m)
Assuming we can only purchase whole slabs
The maximum number of slabs to be bought is 14
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Author: Dan
Dan graduated from the University of Oxford with a First class degree in mathematics. As well as teaching maths for over 8 years, Dan has marked a range of exams for Edexcel, tutored students and taught A Level Accounting. Dan has a keen interest in statistics and probability and their real-life applications.
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Rounding of Numbers Explained for the 11+ Exams!
1. what is rounding of numbers.
Rounding off makes the number simple by keeping its value intact but closer to the next number. Many physical quantities like the amount of money, distance covered, length measured, etc are estimated by rounding off the actual number to the nearest possible whole number. For example:
- £29.99 could be rounded to £30.
- 57 minutes could be rounded to an hour.
1.1 Rounding of Whole and Decimal Numbers
We follow the below steps while rounding whole numbers and decimals:
- Observe the next smaller place value i.e towards the right of the digit that is being rounded off. For example, for rounding to the nearest hundred, observe the digit in the tens place.
- If the digit in the smaller place value is less than 5, then we round down. To round down, replace all the digits after the digit that you are rounding to by 0.
- If the digit in the smaller place value is greater than or equal to 5, then we round up. To round up, add one to the digit that you are rounding to and replace all the digits after it with 0.
1.2 Rounding Off - Example
Example: Round the following numbers to nearest ten:
- Identify the digit in the tens place: 1 Look at the digit to the right of the digit to be rounded: 3 Work out whether to round up or round down: If the digit to the right is greater than or equal to 5, then round up the digit. Otherwise, round down the digit. Here, 3 < 5 i.e. round down. So, the digit to be rounded (1) remains unchanged. Every other digit after it becomes zero. Answer is 410
- Identify the digit in the tens place: 9 Look at the digit to the right of the digit to be rounded: 9 Work out whether to round up or round down: If the digit to the right is greater than or equal to 5, then round up the digit. Otherwise, round down the digit. Here, 9 > 5 i.e. round up. So, 9 + 1 = 10, and this 1 is carried over to the hundreds place to give 3 + 1 = 4 Every other digit after it becomes zero. Answer is 400
Example: Round 9460 to the nearest thousand.
Solution: Consider thousands place and follow the steps as given below:
Work out which digit you need to round: 9 Look at the digit to the right of the digit to be rounded: 4 Work out whether to round up or round down: If the digit to the right is greater than or equal to 5, then round up the digit. Otherwise, round down the digit. Every other digit after it becomes zero. Answer is 9000
Example: Round 0.93 to the nearest tenth.
Solution: Work out which digit you need to round: 9 Look at the digit to the right of the digit to be rounded: 3 Work out whether to round up or round down: If the digit to the right is greater than or equal to 5, then round up the digit. Otherwise, round down the digit. Here, 3 < 5 i.e. round down. So, the digit to be rounded (9) remains unchanged. Every other digit after it becomes zero. Answer is 0.9
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Rounding Decimals Worksheet
FREE DOWNLOAD
Help your students prepare for their Maths GCSE with this free Rounding Decimals worksheet of 44 questions and answers
- Section 1 of the Rounding Decimals worksheet contains 36 skills-based questions, in 3 groups to support differentiation
- Section 2 contains 4 applied Rounding Decimals questions with a mix of worded problems and deeper problem solving questions
- Section 3 contains 4 foundation and higher level GCSE exam style Rounding Decimals questions
- Answers and a mark scheme for all Rounding Decimals questions
- Follows variation theory with plenty of opportunities for students to work independently at their own level
- All questions created by fully qualified expert secondary maths teachers
- Suitable for GCSE maths revision for AQA, OCR and Edexcel exam boards
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Raise maths attainment across your school with hundreds of flexible and easy to use GCSE maths worksheets and lessons designed by teachers for teachers.
Rounding decimals at a glance
Rounding decimals involves approximating a decimal number to make it easier to read and work with. It is common to round decimals to the nearest whole number, nearest tenth, nearest hundredth or nearest thousandth.
In order to round decimal numbers, we can picture where the number would appear on a number line to help us decide whether to round up or down. In general numbers 5 or greater round up and numbers 4 or less round down. For example, when rounding numbers to 2 decimal places, we look at the next decimal place value, the thousandths. If the number in the thousandths column is 5 or greater we round up. If it is 4 or less we round down.
As an alternative to rounding to a given number of decimal places, we could round to a given number of significant figures.
Looking forward, students can then progress to additional number worksheets , for example an equivalent fractions & ordering fractions worksheet or simplifying fractions worksheet .
For more teaching and learning support on Number our GCSE maths lessons provide step by step support for all GCSE maths concepts.
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Rounding reasoning & problem solving
Subject: Mathematics
Age range: 7-11
Resource type: Worksheet/Activity
Last updated
2 October 2016
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great activity.
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This is a great problem solving activity on problem solving, thanks
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The Corbettmaths Practice Questions on Rounding
Are you looking to revise rounding numbers for your Maths exam? Well, Maths Made Easy have worksheets, questions and revision materials in one place.
Must Practice GCSE (9-1) Maths Rounding Numbers Past Paper Questions. Along with Stepwise Solutions, Timing, PDF download to boost your the GCSE Maths Grades. Visit now!
Free rounding numbers GCSE maths revision guide including step by step examples, plus a free worksheets and exam questions.
Test your knowledge by diving into some example questions. Keep track of what you've done and what you still need to cover for free! Create an Account. We've selected the essential questions on Rounding so you can identify difficulties and work on them. Members can access additional questions on this topic, including exam style questions to ...
Revision notes on Rounding & Estimation for the Edexcel GCSE Maths: Foundation syllabus, written by the Maths experts at Save My Exams.
Click here for Questions . Textbook Exercise Previous: Rounding to the Nearest Whole Number Textbook Exercise Next: Rounding to Decimal Places Textbook Exercise
Questions and model answers on Rounding, Estimation & Bounds for the AQA GCSE Maths syllabus, written by the Maths experts at Save My Exams.
Rounding GCSE Revision Description This revision resource contains lots of practice rounding to a given level of accuracy, including rounding: decimals to the nearest integer, to the nearest ten, hundred and thousand, 1, 2 and 3 decimal places and 1 significant figure. Questions are abstract or based on real-life scenarios such as speeds, populations, etc.
Information The marks for each question are shown in brackets use this as a guide as to how much time to spend on each question.
Free rounding decimals GCSE maths revision guide, including step by step examples, exam questions and free worksheet.
3. At a football match between City and Rovers, there were 4486 fans. In the match report, 4486 was rounded to the nearest thousand. (a) Write 4486 to the nearest thousand. At the football match 2156 hot drinks were sold. The caters round this number to the nearest hundred. (b) Round 2156 to the nearest hundred.
Help your students prepare for their Maths GCSE with this free Rounding worksheet of 44 questions and answers. Section 1 of the rounding worksheet contains 36 skills based rounding questions, in 3 groups to support differentiation. Section 2 contains 4 applied rounding questions with a mix of worded problems and deeper problem solving questions.
Must Practice GCSE (9-1) Maths Rounding Numbers, Estimation, Significant Figures, Decimal Places Past Paper Questions. Along with Stepwise Solutions, Timing, PDF download to boost your the GCSE Maths Grades. Visit now!
Ready-to-use mathematics resources for Key Stage 3, Key Stage 4 and GCSE maths classes.
Revision notes on Rounding & Estimation for the AQA GCSE Maths syllabus, written by the Maths experts at Save My Exams.
Revision notes on Bounds for the AQA GCSE Maths syllabus, written by the Maths experts at Save My Exams.
Everything you need to know about Rounding Errors for the GCSE Mathematics (Foundation) AQA exam, totally free, with assessment questions, text & videos.
Click here for Answers . Practice Questions Previous: Quadratic Formula Practice Questions Next: Rounding Highest Lowest Practice Questions
GCSE 9-1 PRACTICE QUESTIONS. These topic-based compilations of questions from past GCSE papers are supplemented by additional questions which have not (yet) been asked - but which could be. The aim has been to provide examples of all the types of questions that might asked on a GCSE or IGCSE paper. Whole numbers and place value.
Must Practice 11 Plus (11+) Rounding Past Paper Questions. Along with Detailed Answers, Timing, pdf download. These past paper questions help you to master the 11+ Exam Maths Questions. Visit now!
Download free Rounding Decimals Worksheet and discover hundreds of other free KS3 and GCSE maths resources including exam papers to support teaching and learning in secondary schools.
Rounding reasoning & problem solving. Just a simple worksheet I created to extend all pupils into reasoning when rounding numbers to the nearest 10,100 & 1000. I have taken ideas from WhiteRose resources and laid them out into F (Fluency), R (Reasoning) and PS (Problem solving). Could be used as a teaching resource or assessment on the objective.