1. 直接写出得数。
$5.98×1000=$ $2.4×5=$ $4.5 - 0.99=$
$3.6 + 3=$ $50÷100=$ $5.15 + 0.5=$
$8.3×7=$ $9.3 - 1.2=$ $0.24×3=$
$1.04×5=$ $0.2×0.8=$ $1.5×40=$

$5.98×1000=5980$
$2.4×5=12$
$4.5 - 0.99=3.51$
$3.6 + 3=6.6$
$50÷100=0.5$
$5.15 + 0.5=5.65$
$8.3×7=58.1$
$9.3 - 1.2=8.1$
$0.24×3=0.72$
$1.04×5=5.2$
$0.2×0.8=0.16$
$1.5×40=60$

2. 列竖式计算。
$8.6 + 23.57=$ $27 - 18.43=$ $23.5 - 14.72=$
$0.278 + 0.65=$ $12.05×1.8=$ $0.565×3.2=$
$8.6 + 23.57=$ $27 - 18.43=$ $23.5 - 14.72=$
$0.278 + 0.65=$ $0.78×0.45=$ $15.02×3.6=$

8.60
+23.57
------
32.17
27.00
-18.43
------
8.57
23.50
-14.72
------
8.78
0.278
+0.650
------
0.928
12.05
× 1.8
--------
9640
1205
--------
21.69
0.565
× 3.2
--------
1130
1695
--------
1.808
8.60
+23.57
------
32.17
27.00
-18.43
------
8.57
23.50
-14.72
------
8.78
0.278
+0.650
------
0.928
0.78
×0.45
------
390
312
------
0.351
15.02
× 3.6
--------
9012
4506
--------
54.072