加减乘除第四章
Presentation
•
Mathematics
•
1st - 6th Grade
•
Hard
Sunny 2020
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5 Slides • 0 Questions
1
加减乘除第四章
by Sunny 2020
2
加
403+689=
先计算个位先。
3+9=12
10+3-1=12
再计算十位。
0+8+1=9
再计算百位。
4+6=10
2+90+1000=1092
3
减
60-5=
先计算个位。
0-5=不够减
10-5=5（向十位借1）
所以60-5=55.
4
乘
7×100=
100后有两个零，所以7.00（小数点要移右2格）7×100=700.
5
除
7÷2=
因为8÷2=4
所以7除二=4-0.5=3.5
双数就能除2，单数就要将被除数+1的数目的除二答案-0.5
加减乘除第四章
by Sunny 2020
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