Tip #38
Eleven times tables.
To multiply a two digit number be eleven add
the numbers together and squeeze the answer in between the original number.
Eg. 54 times 11. Five plus four is nine so the
answer is 594.
When the answer to the adding-up is more than
ten - just increase the first number of the answer by one and put the other number
inbetween.
Eg. 75 times 11 - seven and five is twelve so
the seven becomes eight and the two goes in between making 825.
Thanks Mr Physics for this great suggestion.
