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December 21, 2014

December 21, 2014

Posted by **Brian 4th grade** on Saturday, May 30, 2009 at 9:23pm.

x95

instead of doing al;l the ;long multiplication?

- math -
**Ms. Sue**, Saturday, May 30, 2009 at 9:25pmI don't know of any easier way.

Believe me, the practice will help you for a long time. You should know the multiplication tables as well as you know your own name.

- math -
**timothy**, Saturday, May 30, 2009 at 9:28pmoh...... k thanks anyway

- math -
**MathMate**, Saturday, May 30, 2009 at 11:18pmBrian, glad that you asked.

All you need to do is to look at the question this way:

92x95

92=100-8

95=100-5

92*95

=(100-8-5)||5*8

=87||40

=8740

(The || means stick the numbers together)

Try another example:

98*94

=(100-2-6)||2*6

=9212

With a little practice, you do not have to write them down and do the calculation mentally.

- math -
**Damon**, Sunday, May 31, 2009 at 5:02amWhat MathMate did:

92*95

(100-8)(100-5)

10,000 - 500 - 800 + 40

8740

or my way

95 (100 - 8)

9500 - 760

8740

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