一、直接写出得数。
4.2×5 = ________ 0.75×100 = ________ 5.6÷100 = ________
2.4×5 = ________ 0.3÷0.5 = ________ 0.1÷0.01 = ________
8×0.125 = ________ 21÷0.7 = ________ 0.75÷0.25 = ________
0.25×8 = ________ 72.8×0.01 = ________ 1÷125 = ________
0.63÷0.9 = ________ 3.6×3 = ________ 0.96÷2 = ________
16.8÷4 = ________ 5.6×0.2 = ________ 0.53×0.1 = ________
3.05÷0.5 = ________ 0.21 + 0.7 = ________ 12 - 1.2 = ________
4.2×5 = ________ 0.75×100 = ________ 5.6÷100 = ________
2.4×5 = ________ 0.3÷0.5 = ________ 0.1÷0.01 = ________
8×0.125 = ________ 21÷0.7 = ________ 0.75÷0.25 = ________
0.25×8 = ________ 72.8×0.01 = ________ 1÷125 = ________
0.63÷0.9 = ________ 3.6×3 = ________ 0.96÷2 = ________
16.8÷4 = ________ 5.6×0.2 = ________ 0.53×0.1 = ________
3.05÷0.5 = ________ 0.21 + 0.7 = ________ 12 - 1.2 = ________
答案:
21 75 0.056
@@12 0.6 10 1 30 3
@@2 0.728 0.008
@@0.7 10.8 0.48
@@4.2 1.12 0.053
@@6.1 0.91 10.8
@@12 0.6 10 1 30 3
@@2 0.728 0.008
@@0.7 10.8 0.48
@@4.2 1.12 0.053
@@6.1 0.91 10.8
二、计算下面各题,能简算的要简算。
44.28÷0.9÷4.1 - 1.2 9.5×1.06 - 2.52÷2.4
31.7 - 0.5×0.7 - 1.65 23.7 - 43÷20 - 2.85
44.28÷0.9÷4.1 - 1.2 9.5×1.06 - 2.52÷2.4
31.7 - 0.5×0.7 - 1.65 23.7 - 43÷20 - 2.85
答案:
10.8 9.02 29.7 18.7
三、先通分,再把每组分数按从大到小的顺序排列。
$\frac{1}{3}$、$\frac{9}{10}$和$1\frac{4}{5}$ $\frac{2}{3}$、$\frac{7}{12}$和$\frac{3}{4}$ $\frac{7}{20}$、$\frac{8}{15}$和$\frac{13}{60}$
$\frac{1}{3}$、$\frac{9}{10}$和$1\frac{4}{5}$ $\frac{2}{3}$、$\frac{7}{12}$和$\frac{3}{4}$ $\frac{7}{20}$、$\frac{8}{15}$和$\frac{13}{60}$
答案:
$\frac{1}{3}=\frac{10}{30}$,$\frac{9}{10}=\frac{27}{30}$,$1\frac{4}{5}=\frac{54}{30}$
$1\frac{4}{5}>\frac{9}{10}>\frac{1}{3}$
$\frac{2}{3}=\frac{8}{12}$,$\frac{3}{4}=\frac{9}{12}$
$\frac{3}{4}>\frac{2}{3}>\frac{7}{12}$
$\frac{7}{20}=\frac{21}{60}$,$\frac{8}{15}=\frac{32}{60}$
$\frac{8}{15}>\frac{7}{20}>\frac{13}{60}$
四、将下列小数化成最简分数,将分数化成小数(不能化成有限小数的保留三位小数)。
0.56 = ________ 1.3 = ________ 0.875 = ________ $3\frac{1}{4}$ = ________ $\frac{11}{50}$ = ________ $\frac{2}{15}$≈________
0.56 = ________ 1.3 = ________ 0.875 = ________ $3\frac{1}{4}$ = ________ $\frac{11}{50}$ = ________ $\frac{2}{15}$≈________
答案:
$\frac{14}{25}$,$\frac{13}{10}$,$\frac{7}{8}$,3.25,0.22,0.133
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