Ten plus ten is twenty. count the dots below.
* * * * * * * * * * = 10
* * * * * * * * * * = 10
* * * * * * * * * *
* * * * * * * * * *= 20
You could do it in your head and you could draw a picture like the one above. You could also simply just use a calculator
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10 + 10 + 10 + 10 + 10 + 10 + 10 + 108 = 178
One method is (10×4)+(5×3) = 55 (or mentally add up from left to right).
9 + 9 + 10 + 10 = 38
10 + 10 + 10
16 plus 10 plus 8 plus 6 plus 2 is equal to 42.