1. 直接写出得数。
$7.6 + 2.3 =$ $0.75 + 0.12 =$ $3.7 - 2.3 =$
$6.5 + 1.3 =$ $8.6 - 4.2 =$ $2.4 - 0.4 =$
$6.4 - 0.2 =$ $1.5 + 1.32 =$ $1.2 + 0.4 =$
$1.6 + 3.2 =$ $2.2 + 4.7 =$ $1.42 + 5.13 =$
$4.58 - 1.35 =$ $1.25 + 3.71 =$ $2.14 + 3.6 =$

7.6 + 2.3 = 9.9
0.75 + 0.12 = 0.87
3.7 - 2.3 = 1.4
6.5 + 1.3 = 7.8
8.6 - 4.2 = 4.4
2.4 - 0.4 = 2
6.4 - 0.2 = 6.2
1.5 + 1.32 = 2.82
1.2 + 0.4 = 1.6
1.6 + 3.2 = 4.8
2.2 + 4.7 = 6.9
1.42 + 5.13 = 6.55
4.58 - 1.35 = 3.23
1.25 + 3.71 = 4.96
2.14 + 3.6 = 5.74

2. 在括号里填上适当的数。
(1)$3.64 + 2.32 = (\quad)$
$3$个一$+ 2$个一$= 5$个一是$(\quad)$
$6$个$0.1 + 3$个$0.1 = 9$个$0.1$是$(\quad)$
$4$个$0.01 + 2$个$0.01 = 6$个$0.01$是$(\quad)$
$(\quad) + (\quad) + (\quad) = (\quad)$
(2)$7.56 - 3.24 = (\quad)$
$7$个一$- 3$个一$= 4$个一是$(\quad)$
$5$个$0.1 - 2$个$0.1 = 3$个$0.1$是$(\quad)$
$6$个$0.01 - 4$个$0.01 = 2$个$0.01$是$(\quad)$
$(\quad) + (\quad) + (\quad) = (\quad)$
(3)$6.66 = (\quad) + (\quad) + (\quad)$
(4)$15.001 = (\quad) + (\quad)$

(1)
$3.64 + 2.32 = (5.96)$
$3$个一$+ 2$个一$= 5$个一是$(5)$
$6$个$0.1 + 3$个$0.1 = 9$个$0.1$是$(0.9)$
$4$个$0.01 + 2$个$0.01 = 6$个$0.01$是$(0.06)$
$(5) + (0.9) + (0.06) = (5.96)$
(2)
$7.56 - 3.24 = (4.32)$
$7$个一$- 3$个一$= 4$个一是$(4)$
$5$个$0.1 - 2$个$0.1 = 3$个$0.1$是$(0.3)$
$6$个$0.01 - 4$个$0.01 = 2$个$0.01$是$(0.02)$
$(4) + (0.3) + (0.02) = (4.32)$
(3)
$6.66 = (6) + (0.6) + (0.06)$
(4)
$15.001 = (15) + (0.001)$

3. 列竖式计算。
$5.6 + 2.24 =$ $13.28 - 8.15 =$ $10.61 - 2 =$

5.60
+ 2.24
------
7.84
13.28
8.15
------
5.13
10.61
2.00
------
8.61
结论：$5.6 + 2.24 = 7.84$，$13.28 - 8.15 = 5.13$，$10.61 - 2 = 8.61$