Homework Help Forum: Elementary Math for Educators

Posted by Kendra on Sunday, August 9, 2009 at 8:03pm.

give three ways a student could find the product of 9x7 if she had not memorized this fact.

• Elementary Math for Educators - Ms. Sue, Sunday, August 9, 2009 at 8:08pm

  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.

  
  

• Elementary Math for Educators - smart, Thursday, September 10, 2009 at 5:31pm

  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

  
  

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