Numbers Bigger Than 12Date: 03/22/97 at 20:09:33 From: alice flanders Subject: Multiplication of Numbers Bigger Than 12 Dr. Math, How do you do a hard multiplication problem like 14x7? Date: 03/23/97 at 03:12:27 From: Doctor Mike Subject: Re: Multiplication of Numbers Bigger Than 12 Dear Alice, In such a situation I would break this hard problem up into two easier problems. Since 14 sevens is the same as 10 sevens plus 4 more sevens, it makes sense to do those two problems first, and then add up those two answers to get the grand total answer : How much is 10 sevens ? ................ 70 How much is 4 sevens ? ................ 28 ---- Add them up to find 14 sevens .......... 98 I hope this helps. When your class gets to learning about ways to do multiplication of these larger numbers, be sure to remember that the 1 in 14 really means "ten". That's important to know. -Doctor Mike, The Math Forum Check out our web site! http://mathforum.org/dr.math/ |
Search the Dr. Math Library: |
[Privacy Policy] [Terms of Use]
Ask Dr. Math^{TM}
© 1994- The Math Forum at NCTM. All rights reserved.
http://mathforum.org/dr.math/