Free Printable 三年级数学（异分母分数加法）

1.

$\frac{1}{2}\ +\ \frac{1}{4}\ =\ \$
接下来的正确步骤是哪个？

a)

$\frac{1\times2}{2\times2}\ +\ \frac{1}{4}\$ （把分母同化）

b)

$\frac{1}{2}\ +\ \frac{1}{4}\ =\ \frac{2}{6}$ （直接上下分别相加）

2.

$\frac{1}{2}\ +\ \frac{2}{6}\ =\ \$

a)

$\frac{1}{2}\ +\ \frac{2}{6}\ =\ \frac{3}{8}$

b)

$\frac{3}{6}\ +\ \frac{2}{6}\ =\ \frac{5}{6}$

3.

$\frac{1}{2}\ +\ \frac{3}{8}\ =\ \$

a)

$\frac{4}{8}\ +\ \frac{3}{8}\ =\ \frac{7}{8}$

b)

$\frac{1}{8}\ +\ \frac{3}{8}\ =\ \frac{4}{8}$

4.

$\frac{1}{2}\ +\ \frac{1}{6}\ =\ \$

a)

$\frac{3}{6}\ +\ \frac{2}{6}\ =\ \frac{5}{6}$

b)

$\frac{3}{6}\ +\ \frac{1}{6}\ =\ \frac{2}{3}$

5.

$\frac{1}{2}\ +\ \frac{2}{10}\ =\ \$

a)

$\frac{5}{10}\ +\ \frac{2}{\ 10}\ =\ \frac{7}{10}$

b)

$\frac{1}{2}\ +\ \frac{2}{10}\ =\ \frac{3}{12}$

6.

$\frac{2}{4}\ +\ \frac{3}{8}\ =\ \$

a)

$\frac{2}{8}\ +\ \frac{3}{8}\ =\ \frac{5}{8}$

b)

$\frac{4}{8}\ +\ \frac{3}{8}\ =\ \frac{7}{8}$

7.

$\frac{1}{3}+\frac{1}{9}=$

a)

$\frac{4}{9}$

b)

$\frac{2}{9}$

c)

$\frac{3}{9}$

d)

$\frac{1}{9}$

8.

$\frac{2}{9}+\frac{2}{3}=$

a)

$\frac{8}{9}$

b)

$\frac{4}{9}$

c)

$\frac{3}{9}$

d)

$\frac{7}{9}$

9.

$\frac{2}{3}+\frac{1}{6}=$

a)

$\frac{5}{6}$

b)

$\frac{1}{3}$

c)

$\frac{1}{2}$

d)

1

10.

$\frac{1}{4}+\frac{1}{8}=$

a)

$\frac{3}{8}$

b)

$\frac{3}{4}$

c)

$\frac{5}{8}$

d)

$1$

三年级数学（异分母分数加法）

Total questions: 10

Worksheet time: 6mins

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