11 plus 5-10 plus 20-9 plus 14-10 is equal to 21
nothing at all
85 times 6 equals 510
1544
20 can fit into 510 a total of 25 times. This is calculated by dividing 510 by 20, which equals 25. Since 20 multiplied by 25 equals 500, there is a remainder of 10, but 20 cannot fit into that remainder.
8980