Math tricks and Math is Fun

Some of the teachings of  "Number Devil", which Robert learned

1x1 = 1

11x11 = 121

111x111 = 12321
1111x1111 = 1234321

11111x11111 = 123454321

111111x111111 = 12345654321

1111111x1111111 = 1234567654321

11111111x11111111 = 123456787654321

111111111x111111111 = 12345678987654321

1111111111x1111111111 = 12345678900987654321



1+2+3+4+5+6+7+8+9+10+11+12+13

=1+2+3+4+5+6

+13+12+11+10+9+8+7

-------------------------------

13+13+13+13+13+13+13  =13 x 7 =91

1 x 1 = 1

2 x 2 = 4

3 x 3 = 9               

4 x 4 = 16

5 x 5 = 25

Think in Squares

1 x 1 x 1 = 1

2 x 2 x 2 =  8

3 x 3 x 3 =  27

4 x 4 x 4 =  64

Think in Squares