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
WELLYWANG 0.58230
Round each of the numbers on the signs to 2 decimal places then add all of your answers together.
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Topics: Starter  Approximation  Arithmetic  Rounding
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Previous Day  This starter is for 20 June  Next Day
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 Wellywang 0.58 
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.
Casio Classwiz CalculatorThere is currently a lot of talk about this new calculator being the best in its price range for use in the Maths classroom. The new ClassWiz features a highresolution display making it easier to view numerical formulas and symbols but it isn't a graphical calculator as such (it has the capacity to draw graphs on your smart phone or tablet, via a scannable QR code and an app). As well as basic spreadsheet mode and an equation solving feature you also get the ability to solve quadratic, cubic or quartic polynomial inequalities and the answer is given just as it should be written down, using the correct inequality symbols! This calculator has a highperformance processor and twice the memory of previous models ensuring speedy operation and superior computational power.more... 
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