1. 口算。(建议用时2分钟)
5.2×0.3=
0.2×8.4=
0.6×3.5=
12.6×0.4=
0.3×13.6=
0.05×1.8=
7.1×0.4=
0.6×5.1=
59.2×1=
1.1×0.7=
3×28.3=
0.2×1.6=
0.5×0.4=
1.8×0.2=
0.17×0.4=
4.4×0.2=
12.5×0.4=
9.6×10=
5.3×0.8=
5.1×0.7=
2.1×400=
5.2×0.5=
6.1×3=
2.9×0.3=
5.2×0.3=
0.2×8.4=
0.6×3.5=
12.6×0.4=
0.3×13.6=
0.05×1.8=
7.1×0.4=
0.6×5.1=
59.2×1=
1.1×0.7=
3×28.3=
0.2×1.6=
0.5×0.4=
1.8×0.2=
0.17×0.4=
4.4×0.2=
12.5×0.4=
9.6×10=
5.3×0.8=
5.1×0.7=
2.1×400=
5.2×0.5=
6.1×3=
2.9×0.3=
答案
1.56
1.68
2.1
5.04
4.08
0.09
2.84
3.06
59.2
0.77
84.9
0.32
0.2
0.36
0.068
0.88
5
96
4.24
3.57
840
2.6
18.3
0.87
1.68
2.1
5.04
4.08
0.09
2.84
3.06
59.2
0.77
84.9
0.32
0.2
0.36
0.068
0.88
5
96
4.24
3.57
840
2.6
18.3
0.87
2. 根据23×43=989,在下面的()里填上合适的数。(建议用时2分钟)
98.9=(
9.89=(
0.989=(
0.0989=(
98.9=(
2.3
)×(43
)=(23
)×(4.3
)9.89=(
0.23
)×(43
)=(2.3
)×(4.3
)0.989=(
0.23
)×(4.3
)=(23
)×(0.043
)0.0989=(
0.23
)×(0.43
)=(2.3
)×(0.043
)答案
2. 答案不唯一,如
98.9=2.3×43=23×4.3
9.89=0.23×43=2.3×4.3
0.989=0.23×4.3=23×0.043
0.0989=0.23×0.43=2.3×0.043
98.9=2.3×43=23×4.3
9.89=0.23×43=2.3×4.3
0.989=0.23×4.3=23×0.043
0.0989=0.23×0.43=2.3×0.043
3. 用竖式计算。(建议用时3分钟)
$35×6.7=$
$0.13×0.48=$
$12.6×3.92≈$
(得数保留两位小数)
$35×6.7=$
$0.13×0.48=$
$12.6×3.92≈$
(得数保留两位小数)
答案
234.5
0.0624
49.39
0.0624
49.39
4. 解决问题。(建议用时3分钟)
计算下面长方形的周长和面积。

计算下面长方形的周长和面积。
答案
周长:(6.65+4.8)×2=22.9(cm)
面积:6.65×4.8=31.92(cm²)
面积:6.65×4.8=31.92(cm²)
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