April 3,2009

Think and Discuss

The first thing that pops into my head when I here the terms cross multiply it helps me solve proportion by multiplying the numerator from one ratio and multiply the denominator by the other ratio numerator. After multiplying i would find out if its proportion or not.

Identify the error in this problem:

2/3 = x/12 2x = 36; x = 18

The error in this problem is that they multiplied 3 x 12 which they was suppose to multiply

2 x 12. This is how the problem should have been

2/3 = x/12

3x = 24

x = 8

Are this proportional ?

6/45 and 2/15

6 x 15 = 90 45 x 2 = 90

Both problems are the same answer so this problem is proportional

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## Friday, April 3, 2009

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