We have been looking a number of strategies that we could use to work out mental calculations. Tonight the pupils have been given 8 sums to correct. They need to write down the correct answer. They are not allowed to write down any workings but need to try to work it out using some of the techniques learned in class.
A little example.
28 + 17 =
How could we do this?
Possible Method 1 -
add the tens then the units.
20 + 10 = 30
8 + 7 = 15
15 + 30 = 45
Possible Method 2 -
28 + 17
30 +17 = 47
47-2 = 45
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