1. 在○里填上>、<或=
2.5×3○2.5
1.8×0.2○1.8
3.1×1○3.1
0.23×3○0.23
2.8×0.5○2.8
5.2×1.1○5.2
4.7×2.2○4.7
6.3×0.7○6.3
3.9×2.1○3.9
2.5×3○2.5
1.8×0.2○1.8
3.1×1○3.1
0.23×3○0.23
2.8×0.5○2.8
5.2×1.1○5.2
4.7×2.2○4.7
6.3×0.7○6.3
3.9×2.1○3.9
答案:
解析:本题考查小数乘法的规律。当一个数乘以比1大的数时,结果会比原数大,乘以比1小的数时,结果比原数小,乘以1时,结果与原数相等。
答案:
2.5×3 > 2.5
1.8×0.2 < 1.8
3.1×1 = 3.1
0.23×3 > 0.23
2.8×0.5 < 2.8
5.2×1.1 > 5.2
4.7×2.2 > 4.7
6.3×0.7 < 6.3
3.9×2.1 > 3.9
答案:
2.5×3 > 2.5
1.8×0.2 < 1.8
3.1×1 = 3.1
0.23×3 > 0.23
2.8×0.5 < 2.8
5.2×1.1 > 5.2
4.7×2.2 > 4.7
6.3×0.7 < 6.3
3.9×2.1 > 3.9
2. 计算
7.2×0.5=
0.111×100=
2.3×0.4=
2.9×0.02=
4.3×0.3=
0.4×0.04=
40×0.05=
8.1×0.03=
0.75×0.2=
0.9×0.5=
25×0.08=
3.6×2=
0.4×1.4=
2.3×0.3=
0.26×30=
0.26×3=
0.26×0.3=
0.26×40=
0.26×4=
0.26×0.4=
7.2×0.5=
3.6
0.111×100=
11.1
2.3×0.4=
0.92
2.9×0.02=
0.058
4.3×0.3=
1.29
0.4×0.04=
0.016
40×0.05=
2
8.1×0.03=
0.243
0.75×0.2=
0.15
0.9×0.5=
0.45
25×0.08=
2
3.6×2=
7.2
0.4×1.4=
0.56
2.3×0.3=
0.69
0.26×30=
7.8
0.26×3=
0.78
0.26×0.3=
0.078
0.26×40=
10.4
0.26×4=
1.04
0.26×0.4=
0.104
答案:
解析:这些题目都是小数乘法的口算题。根据小数乘法的计算方法,我们可以直接计算出每个式子的结果。
答案:
7.2×0.5=3.6
0.111×100=11.1
2.3×0.4=0.92
2.9×0.02=0.058
4.3×0.3=1.29
0.4×0.04=0.016
40×0.05=2
8.1×0.03=0.243
0.75×0.2=0.15
0.9×0.5=0.45
25×0.08=2
3.6×2=7.2
0.4×1.4=0.56
2.3×0.3=0.69
0.26×30=7.8
0.26×3=0.78
0.26×0.3=0.078
0.26×40=10.4
0.26×4=1.04
0.26×0.4=0.104
答案:
7.2×0.5=3.6
0.111×100=11.1
2.3×0.4=0.92
2.9×0.02=0.058
4.3×0.3=1.29
0.4×0.04=0.016
40×0.05=2
8.1×0.03=0.243
0.75×0.2=0.15
0.9×0.5=0.45
25×0.08=2
3.6×2=7.2
0.4×1.4=0.56
2.3×0.3=0.69
0.26×30=7.8
0.26×3=0.78
0.26×0.3=0.078
0.26×40=10.4
0.26×4=1.04
0.26×0.4=0.104
3. 计算器上的小数点无法显示了,请你帮忙点上小数点,得到正确的答案
0.7×7.8
07×78= 5 4 6
1.3×0.25
13×025= 0 3 2 5
1.44×3.98
144×398= 5 7 3 1 2
1.06×25
106×25= 2 6 5 0
0.7×7.8
07×78= 5 4 6
1.3×0.25
13×025= 0 3 2 5
1.44×3.98
144×398= 5 7 3 1 2
1.06×25
106×25= 2 6 5 0
答案:
0.7×7.8=5.46
1.3×0.25=0.325
1.44×3.98=5.7312
1.06×25=26.50
1.3×0.25=0.325
1.44×3.98=5.7312
1.06×25=26.50
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