Amazing Math Patterns II

1+2=3
4+5+6=7+8
9+10+11+12=13+14+15
16+17+18+19+20=21+22+23+24
.
.
.
.
upto infinity.


1 x 1 = 1
11 x 11 = 121
111 x 111 = 12321
1111 x 1111 = 1234321
11111 x 11111 = 123454321
111111 x 111111 = 12345654321
1111111 x 1111111 = 1234567654321
11111111 x 11111111 = 123456787654321
111111111 x 111111111=12345678987654321

1 x 9 + 2 = 11
12 x 9 + 3 = 1111
23 x 9 + 4 = 11111
234 x 9 + 5 = 111111
2345 x 9 + 6 = 1111111
23456 x 9 + 7 = 11111111
234567 x 9 + 8 = 111111111
2345678 x 9 + 9 = 111111111
123456789 x 9 +10= 1111111111

1 x 8 + 1 = 9
12 x 8 + 2 = 98
123 x 8 + 3 = 987
1234 x 8 + 4 = 9876
12345 x 8 + 5 = 98765
123456 x 8 + 6 = 987654
1234567 x 8 + 7 = 9876543
12345678 x 8 + 8 = 98765432
123456789 x 8 + 9 = 987654321

Source :http://mykhmsmathclass.blogspot.com/2007/06/amazing-math-patterns.html