2026年计算素养提升四年级数学下册北师大版第42页答案
1. 直接写出得数。
$0.32×100=$ $2.1×0.4=$ $1.3×0.6=$
$1.5×80=$ $2.3×0.02=$ $7.1×0.4=$
$6×1.4=$ $2.01×0.5=$ $2.2÷100=$
$15×0.06=$ $10.3×0.3=$ $42×0.2=$
$0.25×0.4=$ $12.7÷1000=$ $6.1×80=$

答案

0.32×100=32 2.1×0.4=0.84 1.3×0.6=0.78
1.5×80=120 2.3×0.02=0.046 7.1×0.4=2.84
6×1.4=8.4 2.01×0.5=1.005 2.2÷100=0.022
15×0.06=0.9 10.3×0.3=3.09 42×0.2=8.4
0.25×0.4=0.1 12.7÷1000=0.0127 6.1×80=488
2. 列竖式计算。
$3.15×0.8=$ $6.53×2.2=$ $6.7×0.5=$

答案

3.15
× 0.8
------
2.520
3.15×0.8=2.52
6.53
× 2.2
------
1306
1306
------
14.366
6.53×2.2=14.366
6.7
× 0.5
------
3.35
6.7×0.5=3.35
3. 计算下列各题，能简算的要简算。
$0.25×0.125×32$ $42.56-(12.56+2.87)$
$2.9×1.1+1.1×1.1$ $35.4×44.2-35.3×44.2$

答案

$0.25×0.125×32$
$=0.25×0.125×(4×8)$
$=(0.25×4)×(0.125×8)$
$=1×1$
$=1$
$42.56-(12.56+2.87)$
$=42.56-12.56-2.87$
$=30-2.87$
$=27.13$
$2.9×1.1+1.1×1.1$
$=(2.9+1.1)×1.1$
$=4×1.1$
$=4.4$
$35.4×44.2-35.3×44.2$
$=(35.4-35.3)×44.2$
$=0.1×44.2$
$=4.42$
4. 找规律，填一填。
(1)$0,0.2,0.4,0.6,0.8,1$，(
)，$1.4$。
(2)$0.2,0.4,0.8,1.6,3.2$，(
)，$12.8$。
(3)$0.1,0.3,0.4,0.7,1.1,1.8$，(
)，$4.7$。
(4)$18.8,17.5$，(
)$14.9$，(
)，(
)。

答案

(1)
1 + 0.2 = 1.2
答案：1.2
(2)
3.2 × 2 = 6.4
答案：6.4
(3)
1.1 + 1.8 = 2.9
答案：2.9
(4)
17.5 - 1.3 = 16.2
14.9 - 1.3 = 13.6
13.6 - 1.3 = 12.3
答案：16.2，13.6，12.3