规律：小数点向右移，小数变大；向左移，小数变小
口诀：右扩左缩；乘右移，除左移；移动几位看0数
一、小数点移动 (直接写得数)
3.22 × 100 =
322
5.14 × 100 =
514
9.07 × 1000 =
9070
884 ÷ 10 =
88.4
360 ÷ 100 =
3.6
9.16 × 10 =
91.6
500 ÷ 100 =
5
220 ÷ 10 =
22
370 ÷ 1000 =
0.37
162 ÷ 1000 =
0.162
300 ÷ 10 =
30
7.79 × 10 =
77.9
二、单位换算 (利用小数点移动规律)
1.72km = (1720)m
6.75kg = (6750)g
1.56t = (1560)kg
65cm = (0.65)m
49.6kg = (0.0496)t
0.55km = (550)m
324g = (0.324)kg
348kg = (0.348)t
4.57t = (4570)kg
三、小数加减法 (注意小数点对齐)
11 + 1.33 =
12.33
29 + 3.18 =
32.18
50 - 2.55 =
47.45
13 - 4.76 =
8.24
9.56 + 3.42 =
12.98
1.52 + 3.18 =
4.7