1DP
POM 74.49
GOSH 594.60
SNOD 8.88
NIGGLE 9.19
BODGIT 780.65
LIP 2683
SOOP 7.752
FLIRT 7.815
DIDUMS 0.0079
DILLYDALLY 236.960
Round each of the numbers on the signs to one decimal place then add all of your answers together.
Topics: Starter  Approximation  Arithmetic  Rounding
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Previous Day  This starter is for 20 February  Next Day
Pom 74.5 Gosh 594.6 Snod 8.9 Niggle 9.2 Bodgit 780.7 
Lip 2683.0 Soop 7.8 Flirt 7.8 Didums 0.0 DillyDally 237.0 
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.
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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