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算一算
$1.3 + 0.5 =$
$1.4 + 0.4 =$
$1.2 + 1.3 =$
$1.4 + 1.5 =$
$1.4 + 1.6 =$
$1.2 + 1.8 =$
$0.3 + 0.9 =$
$0.5 + 0.8 =$
$1.6 + 0.4 =$
$1.3 + 1.6 =$
$1.3 + 0.5 =$
$1.4 + 0.4 =$
$1.2 + 1.3 =$
$1.4 + 1.5 =$
$1.4 + 1.6 =$
$1.2 + 1.8 =$
$0.3 + 0.9 =$
$0.5 + 0.8 =$
$1.6 + 0.4 =$
$1.3 + 1.6 =$
答案
1.3 + 0.5 = 1.8
1.4 + 0.4 = 1.8
1.2 + 1.3 = 2.5
1.4 + 1.5 = 2.9
1.4 + 1.6 = 3.0
1.2 + 1.8 = 3.0
0.3 + 0.9 = 1.2
0.5 + 0.8 = 1.3
1.6 + 0.4 = 2.0
1.3 + 1.6 = 2.9
1.4 + 0.4 = 1.8
1.2 + 1.3 = 2.5
1.4 + 1.5 = 2.9
1.4 + 1.6 = 3.0
1.2 + 1.8 = 3.0
0.3 + 0.9 = 1.2
0.5 + 0.8 = 1.3
1.6 + 0.4 = 2.0
1.3 + 1.6 = 2.9
一、涂一涂，填一填。
$0.4×2 =$
$0.3×5 =$
$0.01×40 =$
$100×0.01 =$
$0.4×2 =$
$0.3×5 =$
$0.01×40 =$
$100×0.01 =$
答案
0.8 1.5 0.4 1
二、想一想，填一填。
1. $1.2 + 1.2 + 1.2 + 1.2 = (\quad) × (\quad)$
1. $1.2 + 1.2 + 1.2 + 1.2 = (\quad) × (\quad)$
答案
1. 1.2 4
2. $0.03×3$可以看作是（
3
）个（0.03
）连续相加，和是（0.09
）。答案
2. 3 0.03 0.09
3. 0.5 里面有（
5
）个 0.1，0.08 里面有（8
）个 0.01。答案
3. 5 8
4.求4个0.01的和，列式是（
0.01×4
）。答案
4. 0.01×4
5. 一支铅笔0.8元，买3支这种铅笔需要（
2.4
）元，列式是（0.8×3
）。答案
5. 2.4 0.8×3
6. 一个正方形的边长是0.06米，它的周长是（
0.24
）米。答案
6. 0.24
7. 一个长方形的长是 0.8 米，宽是 0.5 米，它的周长是（
2.6
）米，列式是（(0.8+0.5)×2
）。答案
7. 2.6 (0.8+0.5)×2
