1DP

POM 98.32

GOSH 348.60

SNOD 2.20

NIGGLE 1.43

BODGIT 453.95

LIP 2172

SOOP 0.226

FLIRT 7.584

DIDUMS 0.0073

DILLY-DALLY 942.960

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


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

 

Answers

Pom 98.3

Gosh 348.6

Snod 2.2

Niggle 1.4

Bodgit 454.0

Lip 2172.0

Soop 0.2

Flirt 7.6

Didums 0.0

Dilly-Dally 943.0

4027.3

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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