Add and Subtract Unlike Fractions
Elementary School Math · Flashcards · Recall
ELEMENTARY SCHOOL MATH · FLASHCARDS
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QUESTION
State the general formula for
a
b
+
c
d
\frac{a}{b}+\frac{c}{d}
b
a
+
d
c
using a common denominator.
QUESTION
State the general formula for
a
b
+
c
d
\frac{a}{b}+\frac{c}{d}
b
a
+
d
c
using a common denominator.
QUESTION
State the general formula for
a
b
−
c
d
\frac{a}{b}-\frac{c}{d}
b
a
−
d
c
using a common denominator.
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ANSWER
a
b
−
c
d
=
a
d
−
b
c
b
d
\frac{a}{b}-\frac{c}{d}=\frac{ad-bc}{bd}
b
a
−
d
c
=
b
d
a
d
−
b
c
. Cross-multiply and subtract numerators over the product of denominators.
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