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How do I subtract 2 and 4/5 from 1 and 1/2?1and1/2 minus 2and4/5 =?

0 votes
I got -1and1/3? Am I right? Please help me, thank you :)
asked Mar 2, 2013 in PRE-ALGEBRA by skylar Apprentice

1 Answer

+1 vote

the expression is 1 1/2 - 2 4/5
write the mixed numbers as improper fractions
3 /2 - 14 / 5
To Subtract fractions denominators must be equal.
Find the least common multiple (LCM) of the numbers (denominators).
5 = 1 * 5 =5^1
2 = 1 *2 = 2^1
LCM = 2 *5 = 10
Rewrite the fractions with the LCM as the denominator.

15 /10 - 28 / 10
The denominators are equal.
subtract the numerators of the fractions.
=(15-28)/10
=-13/10
rewrite fraction as mixed number
=-1 3/10

answered Mar 3, 2013 by steve Scholar

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