9 x 28 = 252
28 x 9 = 252
3 times with a remainder of 1
126 times 28=3,528 126 * 28 1008 +2520 3,528
3 * 9 is 27 so 3 goes into 28 nine times9 times, with one left over.
4x7=28
9*n + 28 >= -20.
550 divided by 9 = 5.5555 recurring
28
36
28
The product is: 252,000,000