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math

[46 + / 0 -] To figure out the average of a group of numbers, add all the numbers together, then divide by how many numbers you added together.

[6 + / 0 -] To multiply by 9: hold up all fingers, then lower the one for the number you want to multiply by (eg. for 9 x 5 lower the thumb on your left hand). Count the remaining fingers on either side for the answer (eg. 4 on the left, 5 on the right = 45).

[5 + / 3 -] An easy way to figure out the product of 9 and any number between 1 and 10? Subtract one from the number and put it in the 10s place. Then subtract *that* number from nine and put the result in the ones place.

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