1. 直接写出得数。(20☆)
$3 × 4.7 = $
$0.9 × 10.5 = $
$8 × 0.5 = $
$60 × 10.14 = $
$0.17 × 0.3 = $
$0.4 × 10.3 = $
$1.06 × 0.6 = $
$6 × 12.1 = $
$12.5 × 10.8 = $
$0.38 × 0.5 = $
$0.81 × 0.3 = $
$3.25 × 10 = $
$0.4 × 500 = $
$20 × 0.03 = $
$3.5 × 0.2 = $
$0.05 × 80 = $
$3.7 × 0.2 = $
$0.24 × 50 = $
$20 × 0.05 = $
$6.6 × 0.4 = $
$4 × 9.8 = $
$4 × 1.02 = $
$4 × 0.04 = $
$0.25 × 0.04 = $
$0.4 × 2.5 = $
$1.05 × 4 = $
$0.8 × 0.09 = $
$12.5 × 0.08 = $
$5.1 × 2 = $
$2.8 × 0.6 = $
$0.06 × 8 = $
$30 × 1.2 = $
$0.83 × 6 = $
$9.3 × 0.2 = $
$19.4 × 6 = $
$9.4 × 4 = $
$1.05 × 3 = $
$6.9 × 0.5 = $
$0.88 × 3 = $
$0.91 × 8 = $
$3 × 4.7 = $
14.1
$0.9 × 10.5 = $
9.45
$8 × 0.5 = $
4
$60 × 10.14 = $
608.4
$0.17 × 0.3 = $
0.051
$0.4 × 10.3 = $
4.12
$1.06 × 0.6 = $
0.636
$6 × 12.1 = $
72.6
$12.5 × 10.8 = $
135
$0.38 × 0.5 = $
0.19
$0.81 × 0.3 = $
0.243
$3.25 × 10 = $
32.5
$0.4 × 500 = $
200
$20 × 0.03 = $
0.6
$3.5 × 0.2 = $
0.7
$0.05 × 80 = $
4
$3.7 × 0.2 = $
0.74
$0.24 × 50 = $
12
$20 × 0.05 = $
1
$6.6 × 0.4 = $
2.64
$4 × 9.8 = $
39.2
$4 × 1.02 = $
4.08
$4 × 0.04 = $
0.16
$0.25 × 0.04 = $
0.01
$0.4 × 2.5 = $
1
$1.05 × 4 = $
4.2
$0.8 × 0.09 = $
0.072
$12.5 × 0.08 = $
1
$5.1 × 2 = $
10.2
$2.8 × 0.6 = $
1.68
$0.06 × 8 = $
0.48
$30 × 1.2 = $
36
$0.83 × 6 = $
4.98
$9.3 × 0.2 = $
1.86
$19.4 × 6 = $
116.4
$9.4 × 4 = $
37.6
$1.05 × 3 = $
3.15
$6.9 × 0.5 = $
3.45
$0.88 × 3 = $
2.64
$0.91 × 8 = $
7.28
答案
14.1 9.45 4 608.4 0.051 4.12 0.636 72.6 135 0.19 0.243 32.5 200 0.6 0.7 4 0.74 12 1 2.64 39.2 4.08 0.16 0.01 1 4.2 0.072 1 10.2 1.68 0.48 36 4.98 1.86 116.4 37.6 3.15 3.45 2.64 7.28
2. 在$◯$里填上“>”“<”或“=”。(6☆)
$1.01 × 9.4 ◯$
$7.3 × 6.5 ◯$
$47 × 5.8 ◯$
$3.66 × 0.55 ◯$
$9.4 × 27 ◯$
$2.91 × 1.5 ◯$
$1.01 × 9.4 ◯$
>
$9.4$$7.3 × 6.5 ◯$
=
$65 × 0.73$$47 × 5.8 ◯$
>
$4.7 × 0.58$$3.66 × 0.55 ◯$
<
$3.66$$9.4 × 27 ◯$
=
$94 × 2.7$$2.91 × 1.5 ◯$
<
$15 × 2.91$答案
>,=,>,<,=,<
3. 列竖式计算。(24☆)
$4.05 × 0.23 = $
$4.23 × 0.13 = $
$0.045 × 0.24 = $
$0.84 × 2.03 = $
$52.7 × 1.6 = $
$0.054 × 0.35 = $
$4.05 × 0.23 = $
0.9315
$4.23 × 0.13 = $
0.5499
$0.045 × 0.24 = $
0.0108
$0.84 × 2.03 = $
1.7052
$52.7 × 1.6 = $
84.32
$0.054 × 0.35 = $
0.0189
答案
【解析】:
列竖式计算小数乘法时,先按照整数乘法的法则算出积,再看因数中一共有几位小数,就从得数的右边起数出几位,点上小数点。
$4.05×0.23$:
先计算$405×23 = 9315$,因数$4.05$有两位小数,$0.23$有两位小数,一共四位小数,所以$4.05×0.23 = 0.9315$。
$4.23×0.13$:
计算$423×13 = 5499$,因数$4.23$有两位小数,$0.13$有两位小数,共四位小数,所以$4.23×0.13 = 0.5499$。
$0.045×0.24$:
计算$45×24 = 1080$,因数$0.045$有三位小数,$0.24$有两位小数,共五位小数,所以$0.045×0.24 = 0.0108$。
$0.84×2.03$:
计算$84×203 = 17052$,因数$0.84$有两位小数,$2.03$有两位小数,共四位小数,所以$0.84×2.03 = 1.7052$。
$52.7×1.6$:
计算$527×16 = 8432$,因数$52.7$有一位小数,$1.6$有一位小数,共两位小数,所以$52.7×1.6 = 84.32$。
$0.054×0.35$:
计算$54×35 = 1890$,因数$0.054$有三位小数,$0.35$有两位小数,共五位小数,所以$0.054×0.35 = 0.0189$。
【答案】:$0.9315$;$0.5499$;$0.0108$;$1.7052$;$84.32$;$0.0189$;(用时需学生自己记录填写);(共得分数需根据批改情况填写)
列竖式计算小数乘法时,先按照整数乘法的法则算出积,再看因数中一共有几位小数,就从得数的右边起数出几位,点上小数点。
$4.05×0.23$:
先计算$405×23 = 9315$,因数$4.05$有两位小数,$0.23$有两位小数,一共四位小数,所以$4.05×0.23 = 0.9315$。
$4.23×0.13$:
计算$423×13 = 5499$,因数$4.23$有两位小数,$0.13$有两位小数,共四位小数,所以$4.23×0.13 = 0.5499$。
$0.045×0.24$:
计算$45×24 = 1080$,因数$0.045$有三位小数,$0.24$有两位小数,共五位小数,所以$0.045×0.24 = 0.0108$。
$0.84×2.03$:
计算$84×203 = 17052$,因数$0.84$有两位小数,$2.03$有两位小数,共四位小数,所以$0.84×2.03 = 1.7052$。
$52.7×1.6$:
计算$527×16 = 8432$,因数$52.7$有一位小数,$1.6$有一位小数,共两位小数,所以$52.7×1.6 = 84.32$。
$0.054×0.35$:
计算$54×35 = 1890$,因数$0.054$有三位小数,$0.35$有两位小数,共五位小数,所以$0.054×0.35 = 0.0189$。
【答案】:$0.9315$;$0.5499$;$0.0108$;$1.7052$;$84.32$;$0.0189$;(用时需学生自己记录填写);(共得分数需根据批改情况填写)
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