2DP

NID 264.8

GLUM 55.09

DRAT 4.722

LUSH 8.065

BRUM 1.962

OZ 7.873

PLONK 9.213

REEM 0.2338

SLYTHY 0.8405

WELLY-WANG 0.32610

Round each of the numbers on the signs to 2 decimal places then add all of your answers together.

Rounding to 2 Decimal Places

A Mathematics Lesson Starter Of The Day


Topics: Starter | Approximation | Arithmetic | Rounding

  • Transum,
  •  
  • A teaching point worth making is that in long, multi-step calculations it is only usually the final answer that should be rounded. If each of the answers to the intermediate steps are rounded the rounding errors produced will have a cumulative detrimental effect on the accuracy of the final answer.

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Answers

Nid 264.80

Glum 55.09

Drat 4.72

Lush 8.07

Brum 1.96

Oz 7.87

Plonk 9.21

Reem 0.23

Slythy 0.84

Welly-wang 0.33

353.12

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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