1DP

POM 52.73

GOSH 638.20

SNOD 5.85

NIGGLE 3.42

BODGIT 964.55

LIP 3570

SOOP 5.873

FLIRT 1.111

DIDUMS 0.0060

DILLY-DALLY 960.960

Round each of the numbers on the signs to 1 decimal place then add all of your answers together.

Rounding to 1 Decimal Place

A Mathematics Lesson Starter Of The Day


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Topics: Starter | Approximation | Arithmetic | Rounding

  • Mr. MacLeod's Grade 7 Class, St. Stephens Catholic School- Valleyview Alberta
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  • 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,
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  • 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.

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Answers

Pom 52.7

Gosh 638.2

Snod 5.9

Niggle 3.4

Bodgit 964.6

Lip 3570.0

Soop 5.9

Flirt 1.1

Didums 0.0

Dilly-Dally 961.0

6202.8

Would you have got the same answer if you had added all of the original numbers together then rounded off the answer?

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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Laptops In Lessons

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