7 + 6 = 113 ---> 7+6=13 and 7-6=1 so write it 113
9 + 1 = 810 ---> 9+1=10 and 9-1=8 so write it 810
5 + 3 = 28 ---> 5+3=8 and 5-3=2 so write it 28
9 + 6 = 315 ---> 9+6=15 and 9-6=3 so write it 315
Then process in the same manner,
7 + 2 =? ----> 7+2=9 and 7-2=5 so you write it as 59! 59
Well, darling, it's simple math. If you take 405 and add it to another 405, you get 810. So, 405 plus 405 equals 810. Easy peasy lemon squeezy.
19
59
810
510 + 810 = 1320
810 + 354 = 1164
810 + 103 = 913
If one hundred pennies equals one dollar, then 81,000 pennies equals 810 dollars.
3,410 :)
8 : 10 = 16 : 20
9
The answer = 3450