1) 49 = 7^2; 4900 = 70^2; 100 = 10^22) 3 = 1+2; 19 = 9 + 10; 57 = 19 + 383) 90 = 9 * 10; 5 = 4 + 1; 18 = 8 + 10
1) 49 = 7^2; 4900 = 70^2; 100 = 10^2
2) 3 = 1+2; 19 = 9 + 10; 57 = 19 + 38
3) 90 = 9 * 10; 5 = 4 + 1; 18 = 8 + 10