五年級簡便小數乘除法計算題
1.25×0.25×8×4
解:原式=(1.25×8)×(0.25×4)
=10×1
=10
0.125×0.25×0.5×64
解:原式=0.125×0.25×0.5×8×4×2
=(0.125×8)×(0.25×4)×(0.5×2)
=1×1×1
=1
0.23×10.2
解:原式=0.23×(10+0.2)
=2.3+0.046
=2.346
7.5×99.8
解:原式=7.5×(100-0.2)
=750-1.5
=748.5
3.75×31+62.5×3.1
解:原式=3.75×31+6.25×31
=31×(3.75+6.25)
=31×10
=310
7.68÷2.5÷4
解:原式=7.68÷(2.5×4)
=7.68÷10
=0.768
(9.1×4.8×7.5)÷(2.5×1.3×1.6)
解:原式=9.1×4.8×7.5÷2.5÷1.3÷1.6
=(9.1÷1.3)×(4.8÷1.6)×(7.5÷2.5)
=7×3×3
=63
12.5×2.5×8×4
64×12.5×0.25×0.05
0.45×10.2
0.25×99.8
0.358×448+0.677×358-1.25×35.8
1000;10;4.59;24.95;358
五年級簡便小數乘除法計算題
1.25×0.25×8×4
解:原式=(1.25×8)×(0.25×4)
=10×1
=10
0.125×0.25×0.5×64
解:原式=0.125×0.25×0.5×8×4×2
=(0.125×8)×(0.25×4)×(0.5×2)
=1×1×1
=1
0.23×10.2
解:原式=0.23×(10+0.2)
=2.3+0.046
=2.346
7.5×99.8
解:原式=7.5×(100-0.2)
=750-1.5
=748.5
3.75×31+62.5×3.1
解:原式=3.75×31+6.25×31
=31×(3.75+6.25)
=31×10
=310
7.68÷2.5÷4
解:原式=7.68÷(2.5×4)
=7.68÷10
=0.768
(9.1×4.8×7.5)÷(2.5×1.3×1.6)
解:原式=9.1×4.8×7.5÷2.5÷1.3÷1.6
=(9.1÷1.3)×(4.8÷1.6)×(7.5÷2.5)
=7×3×3
=63
12.5×2.5×8×4
64×12.5×0.25×0.05
0.45×10.2
0.25×99.8
0.358×448+0.677×358-1.25×35.8
1000;10;4.59;24.95;358