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1.直接写出得数。
6×0.18=
0.5×0.89=
0.83×0.01=
102÷3=
600÷5=
3.5×0.6=
3.74×0.4=
17.6×0.8=
9×2.04=
5.12+48.8=
15.56+2.64=
2.79×9=
9.16−0.83=
0÷45.6=
0×19.23=
6×0.18=
0.5×0.89=
0.83×0.01=
102÷3=
600÷5=
3.5×0.6=
3.74×0.4=
17.6×0.8=
9×2.04=
5.12+48.8=
15.56+2.64=
2.79×9=
9.16−0.83=
0÷45.6=
0×19.23=
答案
6×0.18=1.08
0.5×0.89=0.445
0.83×0.01=0.0083
102÷3=34
600÷5=120
3.5×0.6=2.1
3.74×0.4=1.496
17.6×0.8=14.08
9×2.04=18.36
5.12+48.8=53.92
15.56+2.64=18.2
2.79×9=25.11
9.16−0.83=8.33
0÷45.6=0
0×19.23=0
0.5×0.89=0.445
0.83×0.01=0.0083
102÷3=34
600÷5=120
3.5×0.6=2.1
3.74×0.4=1.496
17.6×0.8=14.08
9×2.04=18.36
5.12+48.8=53.92
15.56+2.64=18.2
2.79×9=25.11
9.16−0.83=8.33
0÷45.6=0
0×19.23=0
2.想一想,填一填。
(1)$3×19=57$,所以3和19是(
(2)在$A÷B=6$中,(
(3)50以内,6的倍数有(
(4)24的因数有(
(1)$3×19=57$,所以3和19是(
57
)的(因数
),(57
)是3和19的(倍数
)。(2)在$A÷B=6$中,(
A
)是(6 和 B
)的倍数,(6 和 B
)是(A
)的因数。(3)50以内,6的倍数有(
6,12,18,24,30,36,42,48
),7的倍数有(7,14,21,28,35,42,49
);既是6的倍数,又是7的倍数有(42
)。(4)24的因数有(
1,2,3,4,6,8,12,24
),45的因数有(1,3,5,9,15,45
);既是24的因数,又是45的因数有(1,3
)。答案
(1) 57 因数 57 倍数
(2) A 6 和 B 6 和 B A
(3) 6,12,18,24,30,36,42,48 7,14,21,28,35,42,49 42
(4) 1,2,3,4,6,8,12,24 1,3,5,9,15,45 1,3
(2) A 6 和 B 6 和 B A
(3) 6,12,18,24,30,36,42,48 7,14,21,28,35,42,49 42
(4) 1,2,3,4,6,8,12,24 1,3,5,9,15,45 1,3
3. 列竖式计算。
3.28×1.2=
27.65+9.88=
100-23.77=
3.28×1.2=
27.65+9.88=
100-23.77=
答案
3.28×1.2=3.936
27.65+9.88=37.53
100-23.77=76.23
27.65+9.88=37.53
100-23.77=76.23
4.递等式计算。(能简算的要简算)
2.75×0.8+0.8×6.25
31.88+23.33+18.12-6.33
2.75×0.8+0.8×6.25
31.88+23.33+18.12-6.33
答案
2.75×0.8+0.8×6.25=0.8×(2.75+6.25)=0.8×9=7.2
31.88+23.33+18.12-6.33=(31.88+18.12)+(23.33-6.33)=50+17=67
31.88+23.33+18.12-6.33=(31.88+18.12)+(23.33-6.33)=50+17=67
