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Barnett
16 September, 10:09
How do you do a subtraction fraction
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Burch
16 September, 10:45
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divide top from bottom
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Libby Fuller
16 September, 13:58
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3/4-2/5=7/20
Solution with Steps
3/4-2/5=?
The fractions have unlike denominators. First, find the Least Common Denominator and rewrite the fractions with the common denominator.
LCD (3/4, 2/5) = 20
Multiply both the numerator and denominator of each fraction by the number that makes its denominator equal the LCD. This is basically multiplying each fraction by 1.
(3/4*5/5) - (2/5*4/4) = ?
Complete the multiplication and the equation becomes
15/20-8/20=?
The two fractions now have like denominators so you can subtract the numerators.
Then:
15-8/20=7/20
This fraction cannot be reduced.
Therefore:
3/4-2/5=7/20
Solution by Formulas
Apply the fractions formula for subtraction, to
3/4-2/5
and solve
(3*5) - (2*4) / 4*5
=15-8/20
=7/20
Therefore:
3/4-2/5=7/20
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