1. 直接写出得数。(16☆)
5×0.5=
2×0.09=
7×0.8=
8×0.6=
3×1.3=
4×1.7=
5×1.5=
2×3.4=
4×11.2=
3×3.3=
2×21.5=
9×0.05=
2×4.5=
2×32.4=
3×0.72=
4×1.25=
8×1.25=
4×0.25=
4×2.5=
5×2.4=
6×0.13=
12×0.08=
5×0.07=
7×3.6=
4×0.211=
3×1.22=
4×0.42=
2×3.74=
6×6.82=
1×1.99=
0×9.98=
3×0.37=

1. 5×0.5=2.5
2×0.09=0.18
7×0.8=5.6
8×0.6=4.8
3×1.3=3.9
4×1.7=6.8
5×1.5=7.5
2×3.4=6.8
4×11.2=44.8
3×3.3=9.9
2×21.5=43
9×0.05=0.45
2×4.5=9
2×32.4=64.8
3×0.72=2.16
4×1.25=5
8×1.25=10
4×0.25=1
4×2.5=10
5×2.4=12
6×0.13=0.78
12×0.08=0.96
5×0.07=0.35
7×3.6=25.2
4×0.211=0.844
3×1.22=3.66
4×0.42=1.68
2×3.74=7.48
6×6.82=40.92
1×1.99=1.99
0×9.98=0
3×0.37=1.11

2. 先想想积是几位小数,再计算。(16☆)
$3×0.8=3×\frac{(\quad)}{(\quad)}=\frac{(\quad)×(\quad)}{(\quad)}=\frac{(\quad)}{(\quad)}=(\quad)$
$5×0.7=5×\frac{(\quad)}{(\quad)}=\frac{(\quad)×(\quad)}{(\quad)}=\frac{(\quad)}{(\quad)}=(\quad)$

2. $3×0.8=3×\frac{4}{5}=\frac{3×4}{5}=\frac{12}{5}=2.4$
$5×0.7=5×\frac{7}{10}=\frac{5×7}{10}=\frac{35}{10}=3.5$

3. 看图填写乘法算式。(4☆)

3. 0.3 2.4 1.3 10.4

4. 在○里填上“＞”“＜”或“=”。(6☆)
5×0.3 ○1.2
4×1.2 ○5
9×0.3 ○3.8
6×0.6 ○3.6
3×2.1 ○6.2
7×3.2 ○22.1

4. ＞ ＜ ＜ ＝ ＞ ＞

5. 一种植保无人机每小时可喷洒农药 11 公顷,0.4 小时可以喷洒农药多少公顷？(8☆)

5. $11×0.4=4.4$(公顷)
答:0.4 小时可以喷洒农药 4.4 公顷。