Question 682970
 4 {{{1/5}}}
-1 {{{1/2}}}
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First, create a common denominator to subtract the fractions
The least common multiple of 2 and 5 is 10, which is 2*5
Multiply BOTH the denominator and the numerator by the number necessary to get the common denominator of 10.
...
 4{{{(1/5)(2/2)}}} ==> {{{2/highlight(10)}}}
-1{{{(1/2)(5/5)}}} ==> {{{5/highlight(10)}}}
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There is not enough in the {{{2/5}}} to take away {{{5/10}}},
so you have to borrow {{{10/10}}}, which is 1 from the 4
...
{{{3cross(4)}}}{{{(2/10)+(10/10)}}}==> {{{12/10}}}
-1{{{5/10}}}
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Now there is enough to subtract, both the whole numbers and the numerators.
 3{{{12/10}}}
-1{{{5/10}}}
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2{{{7/10}}}
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