There are 366 different Starters of The Day, many to choose from. You will find in the left column below some starters on the topic of Rounding. In the right column below are links to related online activities, videos and teacher resources.

A lesson starter does not have to be on the same topic as the main part of the lesson or the topic of the previous lesson. It is often very useful to revise or explore other concepts by using a starter based on a totally different area of Mathematics.

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### Rounding Starters:

Absolutely Everyone: A choice of questions about the current world population which is constantly changing.

Moon Lengths: Estimate the distances shown on this photograph of the moon's surface.

Pi Day: March 14th is Pi Day. The third month and the 14th day relates to 3.14 which is pi to three significant figures. How many figures of pi can you memorise?

Rounding 1dp: Round off the given numbers to 1 decimal place then add the answers together.

Rounding 2dp: Round off the given numbers to 2 decimal places then add the answers together.

Rounding Whole: Round off the given numbers to the nearest whole number then add the answers together.

#### Upper and Lower Bounds

Determine the upper and lower bounds when rounding or truncating quantities used in calculations.

Transum.org/go/?to=bounds

### Curriculum for Rounding:

#### Year 5

Pupils should be taught to use rounding to check answers to calculations and determine, in the context of a problem, levels of accuracy more...

Pupils should be taught to round any number up to 1 000 000 to the nearest 10, 100, 1000, 10 000 and 100 000 more...

Pupils should be taught to round decimals with two decimal places to the nearest whole number and to one decimal place more...

#### Year 6

Pupils should be taught to round any whole number to a required degree of accuracy more...

Pupils should be taught to identify the value of each digit in numbers given to three decimal places and multiply and divide numbers by 10, 100 and 1000 giving answers up to three decimal places more...

Pupils should be taught to use estimation to check answers to calculations and determine, in the context of a problem, an appropriate degree of accuracy. more...

Pupils should be taught to solve problems which require answers to be rounded to specified degrees of accuracy more...

#### Years 7 to 9

Pupils should be taught to round numbers and measures to an appropriate degree of accuracy [for example, to a number of decimal places or significant figures] more...

Pupils should be taught to use approximation through rounding to estimate answers and calculate possible resulting errors expressed using inequality notation a<x≤b more...

#### Years 10 and 11

Pupils should be taught to apply and interpret limits of accuracy when rounding or truncating, {including upper and lower bounds} more...

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### Notes:

The objective of rounding is often to get a number that is easier to use, at the cost of making it less precise. This approximation is very important in dealing with answers to mathematical problems and making them relevant to the real world. Rounding to a given number of decimal places or significant figures is required of pupils.

See also the "Approximating" Starters. Once the principles of rounding have been understood, a fun way to practise the skills is to play "Rounding Snap".

### Rounding Teacher Resources:

Decimals Line: A number line showing tenths and hundredths with draggable arrows. This is a visual aid designed to be projected onto a whiteboard for whole class exposition

Rounding Snap: If the last card put down equals the previous card to the nearest whole number then all players race to shout SNAP!

### Rounding Activities:

Rough Answers: An exercise on rounding values in a calculation to find an approximate estimate of the answer.

Rounding DP: A self marking exercise requiring students to round numbers to a given number of decimal places.

Rounding SF: A self marking exercise requiring students to round numbers to a given number of significant figures.

Rounding Snap: If the last card put down equals the previous card to the nearest whole number then all players race to shout SNAP!

Rounding Ten: Round the numbers to the nearest whole number or the given power of ten.

Upper and Lower Bounds: Determine the upper and lower bounds when rounding or truncating quantities used in calculations.

### Rounding Videos:

Rounding to decimal places: A straight forward explanation from SLEP

Rounding to significant figures: A straight forward explanation from SLEP

Significant Figures: A CGP Maths Tutor explains what 'significant figures' are then talks you through some examples in this video tutorial.

### Rounding Worksheets/Printables:

Rounding Snap Cards: Printable cards for the Rounding Snap game.

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##### Suggested

An exercise on rounding values in a calculation to find an approximate estimate of the answer.

Transum.org/go/?to=rough

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