《2025年速算天地数学口算心算五年级上册苏教版》

🦋0.3×4=1.2
2×0.5=1
0.6×3=1.8
9×0.7=6.3
0.5×8=4
3×0.3=0.9
0.8×8=6.4
9×0.6=5.4
0.7×5=3.5
0.9×8=7.2
6×0.8=4.8
0.2×9=1.8
7×0.9=6.3
8×0.4=3.2
0.7×6=4.2
0.6×5=3
3×0.7=2.1
7×0.7=4.9
🦋0.2×4=0.8
1.2×4=4.8
0.12×4=0.48
0.24×4=0.96
0.09×9=0.81
0.9×9=8.1
7×0.03=0.21
2×0.23=0.46
1.2×3=3.6
4.3×2=8.6
0.02×4=0.08
2.3×3=6.9
0.23×3=0.69
7×0.09=0.63
4×0.21=0.84
4×0.22=0.88
4×2.2=8.8
0.08×9=0.72

答案： 解析：本题考查的是小数与整数的乘法运算，直接进行口算即可。
答案：
$0.3 × 4 = 1.2$
$2 × 0.5 = 1$
$0.6 × 3 = 1.8$
$9 × 0.7 = 6.3$
$0.5 × 8 = 4$
$3 × 0.3 = 0.9$
$0.8 × 8 = 6.4$
$9 × 0.6 = 5.4$
$0.7 × 5 = 3.5$
$0.9 × 8 = 7.2$
$6 × 0.8 = 4.8$
$0.2 × 9 = 1.8$
$7 × 0.9 = 6.3$
$8 × 0.4 = 3.2$
$0.7 × 6 = 4.2$
$0.6 × 5 = 3$
$3 × 0.7 = 2.1$
$7 × 0.7 = 4.9$
$0.2 × 4 = 0.8$
$1.2 × 4 = 4.8$
$0.12 × 4 = 0.48$
$0.24 × 4 = 0.96$
$0.09 × 9 = 0.81$
$0.9 × 9 = 8.1$
$7 × 0.03 = 0.21$
$2 × 0.23 = 0.46$
$1.2 × 3 = 3.6$
$4.3 × 2 = 8.6$
$0.02 × 4 = 0.08$
$2.3 × 3 = 6.9$
$0.23 × 3 = 0.69$
$7 × 0.09 = 0.63$
$4 × 0.21 = 0.84$
$4 × 0.22 = 0.88$
$4 × 2.2 = 8.8$
$0.08 × 9 = 0.72$

🦋0.18×10=
0.72×10=
0.18×100=
0.46×100=
3.8×10=
0.72×100=
4.6×100=
3.5×10=
3.5×100=
8.7×10=
8.7×100=
0.45×10=
0.45×100=
0.07×10=
0.07×100=
0.07×1000=
0.32×10=
0.32×100=
0.32×1000=
0.008×10=
0.008×100=
0.008×1000=
4.08×100=
🦋0.33×10=
0.027×10=
2.61×100=
0.47×1000=
0.305×10=
0.305×100=
100×8.9=
0.34×1000=
100×14.2=
0.99×1000=
0.1×100=
4.9×1000=
10×0.85=
0.015×1000=

答案： 解析：本题考查的是小数乘10，100，1000的速算方法。
解题的关键在于理解乘以10，100，1000实际上是将小数点向右移动1位，2位，3位。
答案：
$0.18 × 10 = 1.8$
$0.72 × 10 = 7.2$
$0.18 × 100 = 18$
$0.46 × 100 = 46$
$3.8 × 10 = 38$
$0.72 × 100 = 72$
$4.6 × 100 = 460$
$3.5 × 10 = 35$
$3.5 × 100 = 350$
$8.7 × 10 = 87$
$8.7 × 100 = 870$
$0.45 × 10 = 4.5$
$0.45 × 100 = 45$
$0.07 × 10 = 0.7$
$0.07 × 100 = 7$
$0.07 × 1000 = 70$
$0.32 × 10 = 3.2$
$0.32 × 100 = 32$
$0.32 × 1000 = 320$
$0.008 × 10 = 0.08$
$0.008 × 100 = 0.8$
$0.008 × 1000 = 8$
$4.08 × 100 = 408$
$0.33 × 10 = 3.3$
$0.027 × 10 = 0.27$
$2.61 × 100 = 261$
$0.47 × 1000 = 470$
$0.305 × 10 = 3.05$
$0.305 × 100 = 30.5$
$100 × 8.9 = 890$
$0.34 × 1000 = 340$
$100 × 14.2 = 1420$
$0.99 × 1000 = 990$
$0.1 × 100 = 10$
$4.9 × 1000 = 4900$
$10 × 0.85 = 8.5$
$0.015 × 1000 = 15$