3 * 7=3+3+3+3+3+3+3
=6+6+6+3
=12+6+3
=18+3
=21
Vay:3*7=21
3 * 7=3+3+3+3+3+3+3
=6+6+6+3
=12+6+3
=18+3
=21
Vay:3*7=21
1 x 2 = ?
1 x 2 x 3 = ?
1 x 2 x 3 x 4 = ?
1 x 2 x 3 x 4 x 5 = ?
1 x 2 x 3 x 4 x 5 x 6 = ?
1 x 2 x 3 x 4 x 5 x 6 x 7 = ?
1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 = ?
1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 = ?
1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x 10 = ?
2 + 2 + 2 + 2 +2 = ?
1 x 3 + 3 x 5 + 5 x 7 + 7 x 9 + 9 x 11 = ?
7 x 7 =
6 x 6 =
3 x 3 =
k tui,tui k lại
a.X x 5,2 : 4,5 = 10,5
b.5/7 x X + 2/7 x X = 2/3
3 x 3 = ?
3 x 7 = ?
3 x 9 = ?
9 : 0 = 7 x 7 = 9 x 7 = 8 x 9 = 0 x 3 = 0 : 9 = 7 : 0 =
5 x 2
6 x 3
7 x 6
9 x 7
8 x 8
Bài 1 : Tính
8 x 8 =
6 x 4 =
4 x 4
Bài 2 : < , > , =
4 x 6 7 x 5
5 x 7 8 x 9
3 x 5 6 x 9
Tính nhẩm:
3 x 4 = ............... 3 x 5 = ...............
4 x 7 = ............... 5 x 4 = ...............
15 : 3 = .............. 24 : 4 = ..............
5 x 6 = ............... 5 x 9 = ...............
25 : 5 = ..............
2 x 3 + 2 x 7 =....