Find a div m and a mod m when?

Question

1) a=777, m=21

2) a= -123, m=19

3) a=0, m=17

4) a=3, m=5

5) a= 1,234,567, m =1001

Answer 1

a m a div m a mod m check = quotient * m + remainder

777 21 37 0 777

-123 19 -7 10 -123

0 17 0 0 0

3 5 0 3 3

1234567 1001 1233 334 1234567