2DP

NID 188.4

GLUM 26.46

DRAT 8.781

LUSH 9.483

BRUM 6.927

OZ 5.320

PLONK 9.842

REEM 0.1546

SLYTHY 0.7499

WELLY-WANG 0.58230

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


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Topics: Starter | Approximation | Arithmetic | Rounding

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  • 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 188.40

Glum 26.46

Drat 8.78

Lush 9.48

Brum 6.93

Oz 5.32

Plonk 9.84

Reem 0.15

Slythy 0.75

Welly-wang 0.58

256.69

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

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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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