Please help with this math word problem... thanks
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Please help with this math word problem... thanks

[From: ] [author: ] [Date: 12-03-31] [Hit: ]
15/8 can be expressed as something over 16 if you multiply it by 2/2 (which is a nother way of saying 1, since we are multiplying by 1,......
Meena, a machinist, wants to cut a shaft down to a diameter of 1 5/16 inches. How much must Meena decrease the shafts diameter if it now measures 1 7/8 inches?

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1 5/16 = (16 + 5)/16 = 21/16

1 7/8 = (16 + 2*7)/16 = 30/16

Difference = (30 - 21)/16 = 9/16 <<<

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The formula is (Inches to cut = Current length - Desired Length) (Also I am ignoring the 1 in front b/c it's not necessary for the answer)
The current length is 7/8" = 14/16"
so then...
Inches to cut = 14/16 - 5/16 = 9/16 which is your answer of how much to cut off from the diameter.

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Find the common denominator of the fractional parts:

convert the mixed fractions to improper fractions:

1 5/16 = 16/16 + 5/16 = 21/16

1 7/8 = 8/8 + 7/8 = 15/8

15/8 can be expressed as something over 16 if you multiply it by 2/2 (which is a nother way of saying 1, since we are multiplying by 1, we are not changing the fraction)

15/8 * 2/2 = 30/16

Now we can subtract:

30/16 - 21/16 = 9/16
1
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