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October 23, 2014

October 23, 2014

Posted by **leslie** on Tuesday, April 13, 2010 at 10:15pm.

2/5 of 25

- math -
**Jesse**, Tuesday, April 13, 2010 at 10:20pmin math, the word of means times so you would multiply 1/3 x 9 & 2/5 x 25. To set these problems up, you would change the whole numbers (9 & 25) into fractions, so you would have 1/3 x 9/1 for the first one, and 2/5 x 25/1 for the second one. When you line them up on your paper, you can either multiply straight across the tops & the bottoms then reduce, or you can cross-cancel before you multiply. Have you done cross-canceling?

- math -
**alyssa**, Wednesday, April 14, 2010 at 12:59amYou actually don't need to do all of the work Jesse has said. I'll show you a shortcut. Take the denominator (bottom part of a fraction) and divide it by your whole number. Then multiply that by the numerator (top part of a fraction). You can do it really fast in your head.

1/3 of 9 = 9/3=3x1=3

2/5 of 25= 25/5=5x2=10

- math (correct alyssa) -
**PsyDAG**, Wednesday, April 14, 2010 at 2:08pmTake the denominator (bottom part of a fraction) and divide

**your whole number by it**. Then multiply that by the numerator (top part of a fraction).

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