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1. 直接写出得数。(14☆)
$1.5×3 = $
$30.3×2 = $
$1.4×8 = $
$8.4×2 = $
$0.05×5 = $
$9.3×2 = $
$0.91×8 = $
$0.8×8 = $
$104×7 = $
$10.4×6 = $
$0×0.45 = $
$6.2×4 = $
$8.1×9 = $
$0.8×12 = $
$0.25×5 = $
$3.2×9 = $
$55×2 = $
$105×3 = $
$47×5 = $
$36×8 = $
$5.5×2 = $
$1.05×3 = $
$0.47×5 = $
$3.6×8 = $
$32×2 = $
$68×5 = $
$51×4 = $
$305×7 = $
$1.5×3 = $
4.5
$30.3×2 = $
60.6
$1.4×8 = $
11.2
$8.4×2 = $
16.8
$0.05×5 = $
0.25
$9.3×2 = $
18.6
$0.91×8 = $
7.28
$0.8×8 = $
6.4
$104×7 = $
728
$10.4×6 = $
62.4
$0×0.45 = $
0
$6.2×4 = $
24.8
$8.1×9 = $
72.9
$0.8×12 = $
9.6
$0.25×5 = $
1.25
$3.2×9 = $
28.8
$55×2 = $
110
$105×3 = $
315
$47×5 = $
235
$36×8 = $
288
$5.5×2 = $
11
$1.05×3 = $
3.15
$0.47×5 = $
2.35
$3.6×8 = $
28.8
$32×2 = $
64
$68×5 = $
340
$51×4 = $
204
$305×7 = $
2135
答案
4.5 60.6 11.2 16.8 0.25 18.6 7.28 6.4 728 62.4 0 24.8 72.9 9.6 1.25 28.8 110 315 235 288 11 3.15 2.35 28.8 64 340 204 2135
2. 根据第一列的积,写出其他各列的积。(12☆)
|因数|48|480|48|4.8|48|48|0.48|
|因数|95|95|950|95|9.5|0.95|95|
|积|4560|
|因数|48|480|48|4.8|48|48|0.48|
|因数|95|95|950|95|9.5|0.95|95|
|积|4560|
45600
|45600
|456
|456
|45.6
|45.6
|答案
45600 45600 456 456 45.6 45.6
3. 列竖式计算。(24☆)
$50.4×7 = $
$0.85×63 = $
$12.8×14 = $
$380×2.4 = $
$38.3×6 = $
$0.25×14 = $
$50.4×7 = $
352.8
$0.85×63 = $
53.55
$12.8×14 = $
179.2
$380×2.4 = $
912
$38.3×6 = $
229.8
$0.25×14 = $
3.5
答案
1. 计算$50.4×7$：
列竖式：
$50.4$
$×7$
$352.8$
2. 计算$0.85×63$：
列竖式：
$0.85$
$×63$
$25.5$
$51.0$
$53.55$
3. 计算$12.8×14$：
列竖式：
$12.8$
$×14$
$51.2$
$128.0$
$179.2$
4. 计算$380×2.4$：
列竖式：
$380$
$×2.4$
$1520$
$760.0$
$912.0$
5. 计算$38.3×6$：
列竖式：
$38.3$
$×6$
$229.8$
6. 计算$0.25×14$：
列竖式：
$0.25$
$×14$
$1.00$
$2.50$
$3.50$
综上，答案依次为$352.8$；$53.55$；$179.2$；$912$；$229.8$；$3.5$。
列竖式：
$50.4$
$×7$
$352.8$
2. 计算$0.85×63$：
列竖式：
$0.85$
$×63$
$25.5$
$51.0$
$53.55$
3. 计算$12.8×14$：
列竖式：
$12.8$
$×14$
$51.2$
$128.0$
$179.2$
4. 计算$380×2.4$：
列竖式：
$380$
$×2.4$
$1520$
$760.0$
$912.0$
5. 计算$38.3×6$：
列竖式：
$38.3$
$×6$
$229.8$
6. 计算$0.25×14$：
列竖式：
$0.25$
$×14$
$1.00$
$2.50$
$3.50$
综上，答案依次为$352.8$；$53.55$；$179.2$；$912$；$229.8$；$3.5$。
