## Rounding and estimating

Discover our collection of GCSE maths rounding and estimating lessons, activities, powerpoints and notes. These resources are hand-picked by the Tes Maths Panel for their relevance to the 9-1 specifications - use them for planning, homework and revision.

This page contains the very best resources for teaching sections N14 to N16 from the GCSE maths specification (first examined in 2017), combining structured lessons and engaging activities. With rounding and estimating a key component of number sense, and with a few new elements sneaking into this area of the specification, these resources should provide a great support to your planning.

## Rounding to the nearest whole, 10, 100, 1000

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#### Rounding to the nearest 10 numberline

A number line to help children to recognise how to round 2 digit numbers to the nearest 10.

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#### Rounding numbers to nearest 10,100,1000

Useful worksheet when teaching rounding numbers to nearest 10, 100 & 1000

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#### Rounding Codebreakers

Four codebreakers (each with a different cheesy joke) on rounding starting with nearest whole 1,10,100 etc, then decimal places, then significant figures and finally a mixture of all types. Error in sheet 1 corrected.

## Rounding to decimal places

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#### Rounding - Basics, Decimal Places & Sig Figs

A PowerPoint with a simple format for teaching rounding - starts with the basics of rounding to 10s, 100s and 1000s.
Then uses the same format for teaching decimal places and significant figures.
Includes introduction to each part and then questions to practise learning.

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#### Rounding and Approximation

(a) Round a number to a given number of decimal places or significant figures.

(b) Approximate the value to a multiplication/division by rounding each number to 1 significant figure.

(b) Approximate the value to a multiplication/division by rounding each number to 1 significant figure.

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#### Rounding to a given number of decimal places

Worksheet asking students to round to a given number of decimal places, the nearest integer and the nearest 10 and 100. Worksheet is laid out in the form of a table to be filled in. Answers included. If you liked this resource have a look at my rounding to a given number of significant figures worksheet which has a very similar format. Ideas? Corrections? Criticism? Maths jokes? Please comment below!

## Rounding to significant figures

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#### Grand Designs - Estimation, rounding

A full three part lesson on Estimation.
The main part of the lesson involves pupils pretending to be 'Grand Designers&' to estimate a cost to floor a building.
There is a lot in this lesson so modify where necessary!

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#### Rounding to significant figures

*/Note/* This powerpoint is designed as a spine to a lesson, not a complete one. It is deliberately designed to omit explanations (this is your job!) and exciting resources. It is designed to give you something to work from.

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#### Rounding to Significant Figures Powerpoint

A PowerPoint showing how to round to significant figures. Starts with a quiz on rounding to decimal places and ends with a quiz on rounding to significant figures.

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#### Rounding Codebreakers

Four codebreakers (each with a different cheesy joke) on rounding starting with nearest whole 1,10,100 etc, then decimal places, then significant figures and finally a mixture of all types. Error in sheet 1 corrected.

## Estimation questions

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#### Estimation Warehouse

No power and therefore no access to phones (battery's run out) so estimating in your head it is then! Four fairly simple calculations (I've called the final one a challenge as it involves more steps) that could lead to further discussion, something I have added/given the option to people in after the answers are revealed in the powerpoint. You can either do straight from the powerpoint or from the worksheet (saving the planet option available therefore).

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#### Rounding and Approximation

(a) Round a number to a given number of decimal places or significant figures.

(b) Approximate the value to a multiplication/division by rounding each number to 1 significant figure.

(b) Approximate the value to a multiplication/division by rounding each number to 1 significant figure.

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#### GCSE Maths:Estimation questions with answers sheet

Calculations given and students show how to get the estimated answer.

## Bounds of error

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#### GCSE - Bounds

Calculations in terms of bounds (subtracting/adding/multiplying/dividing).

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#### Errors in Truncation

Using calculator display screens with digits removed, pupils are asked to use inequalities to show the maximum errors in truncating the numbers

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#### Finding and Using Upper and Lower Bounds for varying degrees of accuracy

In the first activity, students must find the upper and lower bounds of different numbers which have been rounded to varying degrees of accuracy.

In the second activity, students then use these numbers to create the overall upper and lower bound of two variables combined either with addition, subtraction, multiplication or division.

In the second activity, students then use these numbers to create the overall upper and lower bound of two variables combined either with addition, subtraction, multiplication or division.