Free Printable 三年级数学：分数的加法

1.

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

a)

$\frac{2}{6}$

b)

$\frac{1}{6}$

c)

$\frac{1}{2}$

d)

$\frac{4}{6}$

2.

$\frac{1}{7}\ +\ \ ?\ =\frac{6}{7}$

a)

$\frac{2}{7}$

b)

$\frac{3}{7}$

c)

$\frac{4}{7}$

d)

$\frac{5}{7}$

3.

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

a)

$\frac{1}{3}$

b)

$\frac{2}{3}$

c)

$\frac{2}{6}$

4.

$\frac{1}{5}\ +\ \frac{2}{5}\ =\$

a)

$\frac{3}{5}$

b)

$\frac{3}{10}$

c)

$\frac{4}{5}$

5.

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

a)

$\frac{5}{8}$

b)

$\frac{4}{8}$

c)

$\frac{1}{2}$

6.

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

a)

$\frac{2}{4}$

b)

$\frac{1}{4}$

c)

$1$

7.

$\frac{4}{11}+\frac{7}{11}=?$

a)

$\frac{11}{22}$

b)

$\frac{11}{11}$

c)

$1$

d)

$\frac{3}{11}$

8.

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

a)

$\frac{2}{8}$

b)

$\frac{3}{8}$

c)

$\frac{4}{8}$

d)

$\frac{5}{8}$

9.

七分之四加七分之一等于多少？

a)

$\frac{5}{7}$

b)

$\frac{1}{2}$

c)

$\frac{3}{7}$

d)

$\frac{5}{14}$

10.

计算两个分数的和，把答案化为最简分数。

a)

$\frac{1}{3}$

b)

$\frac{2}{3}$

c)

$\frac{1}{2}$

d)

$\frac{4}{6}$

11.

$\frac{2}{5}$ + $\frac{1}{2}$ =

a)

$\frac{8}{10}$

b)

$\frac{9}{10}$

c)

$\frac{4}{5}$

d)

$\frac{7}{8}$

12.

$\frac{4}{9}+\frac{5}{9}=?$

a)

1

b)

$\frac{9}{18}$

c)

$\frac{5}{4}$

d)

$\frac{4}{5}$

13.

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

a)

$\frac{2}{5}$

b)

$\frac{4}{10}$

c)

$\frac{4}{5}$

14.

$\frac{2}{4}+\frac{1}{4}=$

a)

$\frac{3}{8}$

b)

$\frac{1}{2}$

c)

$\frac{3}{4}$

d)

$\frac{1}{4}$

15.

$\frac{1}{2}\ +\ \frac{1}{4}\ =$

a)

1

b)

2

c)

3

d)

$\frac{3}{4}$

16.

$\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）

17.

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

a)

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

b)

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

18.

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

a)

$\frac{2}{7}$

b)

$\frac{1}{7}$

c)

$\frac{7}{12}$

d)

$\frac{2}{12}$

19.

$\frac{2}{5}$ + $\frac{1}{2}$ =

a)

$\frac{8}{10}$

b)

$\frac{9}{10}$

c)

$\frac{4}{5}$

d)

$\frac{7}{8}$

20.

$\frac{2}{5}$ + $\frac{1}{3}$ =

a)

$\frac{9}{15}$

b)

$\frac{10}{15}$

c)

$\frac{11}{15}$

d)

$\frac{12}{15}$

21.

$\frac{3}{4}+\frac{1}{6}=$

a)

$\frac{11}{12}$

b)

$\frac{4}{12}$

c)

$\frac{4}{10}$

d)

$\frac{3}{10}$

22.

以下哪一个算式是错误的？

a)

$\frac{3}{7}+\frac{2}{7}=\frac{3+2}{7}=\frac{5}{7}$

b)

$\frac{2}{8}+\frac{4}{8}=\frac{2+4}{8}=\frac{6}{8}=\frac{3}{4}$

c)

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

d)

$\frac{1}{9}+\frac{2}{9}=\frac{1+2}{9}=\frac{3}{9}=\frac{1}{3}$

23.

静雯喝了 $\frac{8}{10}$ 盒牛奶，她的妹妹喝了 $\frac{1}{5}$ 盒牛奶。她们共喝了几分之几盒牛奶？

a)

$\frac{9}{10}$

b)

$\frac{8}{10}$

c)

1

d)

2

三年级数学：分数的加法

Total questions: 23

Worksheet time: 40mins

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