210 Appendix C
one more 3 makes 13 threes. If you know 12 fours are 48, just add
another 4 to get 52.
Th en, when you know your 13 times table, learn the 14 times table.
You have two ways to do this. You can factor 14 to 2 times 7. Th en
you just double the number and multiply by 7, or multiply by 7 and
double the answer. So, 6 times 14 would be 6 times 7 (42), then
doubled is 84. Th at was easy. Also you could have doubled the 6 fi rst
to get 12, and multiply 12 by 7 to get 84 again. If you know your 12
times table, that is easy as well. Another alternative is to say 6 times
10 is 60, plus 6 times 4 is 24. Add 60 and 24 for the answer, 84.
Calculate these often and you will learn your tables without even
trying. Th en you will fi nd you can multiply and divide directly by
13, 14 and 15. Th is will give you an advantage over the other kids.
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