2 × 3 = 6 6 : 2 = 3 2 × 4 = 8 8 : 2 = 4 |
2 × 7 = 14 14 : 2 = 7 2 × 5 = 10 10 : 2 = 5 |
2 × 9 = 18 18 : 2 = 9 2 × 2 = 4 4 : 2 = 2 |
2 × 6 = 12 12 : 2 = 6 2 × 8 = 16 16 : 2 = 8. |
bài 7 nhân,chia
2+2+2+2+2+2+2=14
2 được lấy 7 lần2x7 14
1.tínhM:3+3+3+3+3=15 3x5=15
a.9+9 b.8+8+8+8+8+8
c.6+6+6+6 d.2+2+2
2.nối
2x7 8
4x2 12
6x2 14
7x3 6
5x9 21
3x2 45
3.số?
...x7=70
9x...=36
8x4=...2
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oooo
lần 1:oooooooo
lần 2:oooooo oo
lần 3:oooo oo oo
lần 4:oo oo oo oo
8:2=4
4.tính
M:10-2-2-2-2=2
10:5=2
a.15-5-5=5 b.20-4-4-4-4=4
c.18-6-6=6 d.25-5-5-5-5=5
5.nối
4:2 6
9:3 9
18:2 3
25:5 7
21:3 5
6.số?
...6:2=8
20:...=5
16:4=...
Số?
4:2=… 8:2=…
14:2=… 12:2=…
6:2=… 18:2=…
16:2=… 12:2=…
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19=?
Tính nhẩm:
8 : 2 = ..... 6 : 2 = .....
4 : 2 = ..... 2 : 2 = .....
12 : 2 = ..... 16 : 2 = .....
18 : 2 = ..... 10 : 2 = .....
20 : 2 = ..... 14 : 2 = .....
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20=
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20=
Đố mọi người : 1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20 = ?
Tính nhẩm:
a)
7 + 5 = ..... 5 + 7 = .....
4 + 9 = ..... 9 + 4 = .....
8 + 7 = ..... 7 + 8 = .....
2 + 9 = ..... 9 + 2 = .....
b)
16 − 8 = ..... 14 − 7 = .....
11 − 9 = ..... 17 − 9 = .....
12 − 5 = ..... 16 − 9 = .....
13 − 6 = ..... 15 − 8 = .....
tình nhanh
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19
