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5th Grade · Session 1 of 10

Fractions — Like Denominators

Add and subtract fractions that share the same denominator. The denominator stays the same — only the numerators change.

A

Addition

Add the numerators. Keep the denominator. Simplify if you can.

1
38+28\dfrac{3}{8} + \dfrac{2}{8}
=
2
15+35\dfrac{1}{5} + \dfrac{3}{5}
=
3
29+49\dfrac{2}{9} + \dfrac{4}{9}
=
4
512+412\dfrac{5}{12} + \dfrac{4}{12}
=
B

Subtraction

Subtract the numerators. Keep the denominator. Simplify if you can.

5
57−27\dfrac{5}{7} - \dfrac{2}{7}
=
6
910−310\dfrac{9}{10} - \dfrac{3}{10}
=
7
712−112\dfrac{7}{12} - \dfrac{1}{12}
=
8
1115−415\dfrac{11}{15} - \dfrac{4}{15}
=
C

Word Problems

Write the equation, then solve.

9

A pizza is cut into 8 equal slices. You eat 38\dfrac{3}{8} of it and your friend eats 28\dfrac{2}{8} of it. What fraction of the pizza did you eat together?

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10

A ribbon is 910\dfrac{9}{10} of a metre long. You cut off 310\dfrac{3}{10} of a metre. How much ribbon is left?

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