三年级下册数学课件-7.1 整理与提高 乘与除（小树有多少颗） 沪教版 (共23张PPT)

2 x 3 =
6
=
=
2+2+2
3+3
5 x 4
= 20
=
=
4+4+4+4+4
5+5+5+5
9 + 9 =
18
9 + 8 =
17
=
9 x 2
6 + 6 =
6 x 2
7+7+7+7 =
7 x 4
9+ +
3 x 9=
9
9
+ + +
20x4=
20
20
20
20
20x3=
20x3=
20+20+20=60
20
60
+ 20
20
20x3=
20也就是2个十
2个十x 3 =
6个十
=60
20x3=
6
0
3x2=
6
30x2=
60
300x2=
600
5x4=
20
50x4=
200
500x4=
2000
30 x 4 =
120
50 x 8 =
400
9 x 600 =
5400
40 x 5 =
200
60 x 7 =
420
20 x 5 =
100
=