Elementary Math for Educators
posted by Kendra on .
give three ways a student could find the product of 9x7 if she had not memorized this fact.

Add nine 7's
Multiply 3 times 7. Multiply that answer by 3.
Multiply 10 times 7 and subtract 9.
Also  remember that the digits of any product of 9 and another number add up to 9 or a multiple of 9.
Examples: 18, 27, 36, etc. 
1. Add nine 7's
2. Multiply 3 times 7. Multiply that answer by 3.
3. Multiply 10 times 7 and subtract 9.
4. put your seven finger down and count on both sides and put the numbers together