三、计算题。（真题·宁波镇海）（共35分）

1. 直接写出得数
0.68×100=68
125×8=1000
3.4+2.6=6
10-6.3=3.7
1-0.09=0.91
25×4÷25×4=16
0÷78=0
56÷1000×10=0.56
2. 列竖式计算，带*的要验算
12.53+4.67=17.2
```
12.53
+ 4.67
--------
17.20
```
*16.2-7.85=8.35
```
16.20
7.85
--------
8.35
```
验算：
```
8.35
+ 7.85
--------
16.20
```
256×13=3328
```
256
× 13
------
768
256
------
3328
```
3. 怎样简便就怎样算
3200÷25÷4
=3200÷(25×4)
=3200÷100
=32
125×32×25
=125×(8×4)×25
=(125×8)×(4×25)
=1000×100
=100000
101×78
=(100+1)×78
=100×78+1×78
=7800+78
=7878
45×99+45
=45×(99+1)
=45×100
=4500
78.5-23.6-16.4
=78.5-(23.6+16.4)
=78.5-40
=38.5
12.63+5.24+7.37+4.76
=(12.63+7.37)+(5.24+4.76)
=20+10
=30

1.直接写得数。(10分)
$4.3+13.6=$
$10-8.7=$
$4.32+2.56=$
$28.8×100=$
$125×11×8=$
$42÷100=$
$524-299=$
$2.8+82=$
$1-0.99=$
$4+12÷4+12=$

1. 17.9 1.3 6.88 2880 11000 0.42 225 84.8 0.01 19

2.列竖式计算,带※的要验算。(7分)
$37.4+6.56=$
$9.23-1.76=$
$※8.05-2.5=$

2.(验算略)43.96 7.47 5.55

3.计算下面各题,能简算的要简算。(18分)
$25×129×4$
$22.9+9.46-15.66$
$15.08-2.74+7.26$
$45×201-45$
$6000÷(75-60)-20$
$19.2+1.26+0.8+5.74$

3. 12900 16.7 19.6 9000 380 27