1DP

POM 1.60

GOSH 281.70

SNOD 3.27

NIGGLE 1.02

BODGIT 731.25

LIP 9162

SOOP 3.314

FLIRT 6.131

DIDUMS 0.0080

DILLY-DALLY 704.960

Round each of the numbers on the signs to one decimal place then add all of your answers together.

# Rounding to 1 Decimal Place

## A Mathematics Lesson Starter Of The Day

Topics: Starter | Approximation | Arithmetic | Rounding

• Mr. MacLeod's Grade 7 Class, St. Stephens Catholic School- Valleyview Alberta
•
• My Grade 7 class would like to be able to use a calculator to save time on this question, but they did enjoy it.
• Transum,
•
• Even the most confident pupils might hesitate when you ask them to round -37.25 to one decimal place. Do you know the answer? Are you sure? Have a look at the extension activity below then let us know what you think.

How did you use this starter? Can you suggest how teachers could present or develop this resource? Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for Maths teachers anywhere in the world.

Previous Day | This starter is for 20 February | Next Day

 Pom 1.6 Gosh 281.7 Snod 3.3 Niggle 1.0 Bodgit 731.3 Lip 9162.0 Soop 3.3 Flirt 6.1 Didums 0.0 Dilly-Dally 705.0

### 10895.3

Note to teacher: Doing this activity once with a class helps students develop strategies. It is only when they do this activity a second time that they will have the opportunity to practise those strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter from random numbers.

## Extension

Do you know how to round negative numbers? If values exactly half way between get rounded up should -37.25 be rounded to -37.2 or -37.3? Does ‘rounded up’ mean rounded to the larger value or the value furthest away from zero?

A system of rounding commonly used in bookkeeping and some computing procedures is called ‘round half to even’. In this system half way values are rounded either up or down in order to make the last digit an even number.

So, for example, 37.25 becomes 37.2, 37.15 also becomes 37.2 and −37.25 becomes −37.2 without any doubt.

This method of rounding is also useful when rounding values in large data sets as it evens out the rounding ups and rounding downs for the half way values.

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Here is the URL which will take them to a related student activity.

Transum.org/go/?to=roundingdp

## Curriculum Reference

See the National Curriculum page for links to related online activities and resources.

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