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1. 直接写出得数。(20☆)
$0.9×0.5=$
$0.2×0.2=$
$85×0.01=$
$0.84×0.05=$
$10×0.1=$
$80×0.4=$
$36×0.3=$
$0.7×0.8=$
$1.8×0.5=$
$0.8×0.2=$
$50×0.12=$
$40×0.7=$
$1.5×0.04=$
$0.15×0.3=$
$7.8×0.5=$
$1.6×0.002=$
$0.5×0.8=$
$0.5×1.1=$
$0.54×0.5=$
$2.73×0.6=$
$100×0.25=$
$0.7×0.4=$
$13.8×7=$
$0.9×9.42=$
$0.12×40=$
$4.5×3=$
$0.3×0.31=$
$1.54×0.7=$
$1.2 - 0.8=$
$23.9 + 6.1=$
$1.2×4=$
$0.8×0.16=$
$7.8 - 6.5=$
$3.3×30=$
$9.85 + 0.5=$
$0.9×7.95=$
$2.4×0.8=$
$1.2×0.9=$
$11.8×0.2=$
$3.3×0.4=$
$0.9×0.5=$
0.45
$0.2×0.2=$
0.04
$85×0.01=$
0.85
$0.84×0.05=$
0.042
$10×0.1=$
1
$80×0.4=$
32
$36×0.3=$
10.8
$0.7×0.8=$
0.56
$1.8×0.5=$
0.9
$0.8×0.2=$
0.16
$50×0.12=$
6
$40×0.7=$
28
$1.5×0.04=$
0.06
$0.15×0.3=$
0.045
$7.8×0.5=$
3.9
$1.6×0.002=$
0.0032
$0.5×0.8=$
0.4
$0.5×1.1=$
0.55
$0.54×0.5=$
0.27
$2.73×0.6=$
1.638
$100×0.25=$
25
$0.7×0.4=$
0.28
$13.8×7=$
96.6
$0.9×9.42=$
8.478
$0.12×40=$
4.8
$4.5×3=$
13.5
$0.3×0.31=$
0.093
$1.54×0.7=$
1.078
$1.2 - 0.8=$
0.4
$23.9 + 6.1=$
30
$1.2×4=$
4.8
$0.8×0.16=$
0.128
$7.8 - 6.5=$
1.3
$3.3×30=$
99
$9.85 + 0.5=$
10.35
$0.9×7.95=$
7.155
$2.4×0.8=$
1.92
$1.2×0.9=$
1.08
$11.8×0.2=$
2.36
$3.3×0.4=$
1.32
答案
0.45 0.04 0.85 0.042 1 32 10.8 0.56 0.9 0.16 6 28 0.06 0.045 3.9 0.0032 0.4 0.55 0.27 1.638 25 0.28 96.6 8.478 4.8 13.5 0.093 1.078 0.4 30 4.8 0.128 1.3 99 10.35 7.155 1.92 1.08 2.36 1.32
2. 在$◯$里填上“＞”“＜”或“=”。(6☆)
$5.5×0.9◯$
$0.3×1.01◯$
$12.5×(8 + 0.8)◯$
$9.9◯$
$5.6×0.2×6◯$
$3.7×2.5×0.4◯$
$5.5×0.9◯$
＜
$5.5$$0.3×1.01◯$
＞
$0.3×0.9$$12.5×(8 + 0.8)◯$
＜
$12.5×8 + 12.5$$9.9◯$
＜
$1.1×9.9$$5.6×0.2×6◯$
=
$5.6×1.2$$3.7×2.5×0.4◯$
＞
$2.5×3.7×0.1$答案
＜ ＞ ＜ ＜ = ＞
3. 按要求填写下表。(12☆)
|算式|得数保留整数|得数保留一位小数|得数保留两位小数|
|$6.08×1.3$| | | |
|$0.07×4.55$| | | |
|$1.55×2.3$| | | |
|$0.86×1.4$| | | |
|算式|得数保留整数|得数保留一位小数|得数保留两位小数|
|$6.08×1.3$| | | |
|$0.07×4.55$| | | |
|$1.55×2.3$| | | |
|$0.86×1.4$| | | |
答案
8 7.9 7.90 0 0.3 0.32 4 3.6 3.57 1 1.2 1.20
4. 列竖式计算,带*的用乘法交换律验算。(14☆)
$0.58×1.6=$
$3.16×15=$
$*6.4×0.25=$
$0.58×1.6=$
0.928
$3.16×15=$
47.4
$*6.4×0.25=$
1.6
答案
0.928 47.4 1.6
