1. 口算。(建议用时4分钟)
3.02 + 1.98 =
4.06 × 20 =
5.6 ÷ 0.56 =
1.82 - 0.62 =
3.01 + 1.09 =
0.8 × 2.5 =
2.1 × 0.4 =
6.04 × 6 =
3.2 × 50 =
0.9 ÷ 0.3 =
1.7 ÷ 5 =
1.65 + 2.75 =
$\frac{3}{13} + \frac{5}{13} =$
$\frac{7}{9} + \frac{8}{9} =$
$\frac{3}{17} + \frac{7}{17} =$
$\frac{1}{3} + \frac{1}{3} =$
$\frac{2}{3} + \frac{2}{5} =$
$\frac{1}{12} + \frac{1}{3} =$
$\frac{8}{15} + \frac{1}{3} =$
$\frac{5}{9} + \frac{1}{3} =$
$\frac{1}{4} - \frac{1}{5} =$
$\frac{3}{7} + \frac{1}{5} =$
$\frac{11}{12} - \frac{1}{4} =$
$\frac{1}{3} - \frac{2}{7} =$
3.02 + 1.98 =
4.06 × 20 =
5.6 ÷ 0.56 =
1.82 - 0.62 =
3.01 + 1.09 =
0.8 × 2.5 =
2.1 × 0.4 =
6.04 × 6 =
3.2 × 50 =
0.9 ÷ 0.3 =
1.7 ÷ 5 =
1.65 + 2.75 =
$\frac{3}{13} + \frac{5}{13} =$
$\frac{7}{9} + \frac{8}{9} =$
$\frac{3}{17} + \frac{7}{17} =$
$\frac{1}{3} + \frac{1}{3} =$
$\frac{2}{3} + \frac{2}{5} =$
$\frac{1}{12} + \frac{1}{3} =$
$\frac{8}{15} + \frac{1}{3} =$
$\frac{5}{9} + \frac{1}{3} =$
$\frac{1}{4} - \frac{1}{5} =$
$\frac{3}{7} + \frac{1}{5} =$
$\frac{11}{12} - \frac{1}{4} =$
$\frac{1}{3} - \frac{2}{7} =$
答案
1. 5
81.2
10
1.2
4.1
2
0.84
36.24
160
3
0.34
4.4
$\frac{8}{13}$
$\frac{5}{3}$
$\frac{10}{17}$
$\frac{2}{3}$
$\frac{16}{15}$
$\frac{5}{12}$
$\frac{13}{15}$
$\frac{8}{9}$
$\frac{1}{20}$
$\frac{22}{35}$
$\frac{2}{3}$
$\frac{1}{21}$
81.2
10
1.2
4.1
2
0.84
36.24
160
3
0.34
4.4
$\frac{8}{13}$
$\frac{5}{3}$
$\frac{10}{17}$
$\frac{2}{3}$
$\frac{16}{15}$
$\frac{5}{12}$
$\frac{13}{15}$
$\frac{8}{9}$
$\frac{1}{20}$
$\frac{22}{35}$
$\frac{2}{3}$
$\frac{1}{21}$
2. 在()里填上合适的数。(建议用时2分钟)
$\frac{5}{8}+( )=\frac{7}{8}$
$\frac{8}{9}-( )=\frac{5}{36}$
$\frac{2}{5}+\frac{3}{4}=( )+\frac{3}{40}$
$\frac{3}{10}+( )=\frac{7}{5}$
$( )-\frac{2}{7}=\frac{3}{14}$
$1-\frac{5}{24}=\frac{1}{4}+( )$
$\frac{5}{8}+( )=\frac{7}{8}$
$\frac{8}{9}-( )=\frac{5}{36}$
$\frac{2}{5}+\frac{3}{4}=( )+\frac{3}{40}$
$\frac{3}{10}+( )=\frac{7}{5}$
$( )-\frac{2}{7}=\frac{3}{14}$
$1-\frac{5}{24}=\frac{1}{4}+( )$
答案
2. $\frac{1}{4}$
$\frac{3}{4}$
$\frac{43}{40}$
$\frac{11}{10}$
$\frac{1}{2}$
$\frac{13}{24}$
$\frac{3}{4}$
$\frac{43}{40}$
$\frac{11}{10}$
$\frac{1}{2}$
$\frac{13}{24}$
3. 计算下面各题,能用简便算法的就用简便算法。(建议用时2分钟)
9.2 - 7.2 ÷ 0.8
0.78 × 101
3.26 × 10.7 - 3.26 × 0.7
9.2 - 7.2 ÷ 0.8
0.78 × 101
3.26 × 10.7 - 3.26 × 0.7
答案
3. 0.2
78.78
32.6
78.78
32.6
4. 解决问题。(建议用时2分钟)
明明从家出发,先向西偏北$40°$方向走2 km到书店,再向西偏南$30°$方向走1 km到西湖。请你先补完路线图,再写出从西湖原路返回家的路线。

明明从家出发,先向西偏北$40°$方向走2 km到书店,再向西偏南$30°$方向走1 km到西湖。请你先补完路线图,再写出从西湖原路返回家的路线。
答案
4.
先向东偏北 30°方向走 1 km 到书店,再向东偏南 40°方向走2 km 到家
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