You can put this solution on YOUR website! 315 divided by 21 is equal to 15
this means that 21 multiplied by 15 is equal to 315.
this means that 21 can be added to 0 for 15 times and the result will be 315.
this also means that you can subtract 21 from 315 for 15 times and the remainder will be equal to 0.
let's try a smaller number so you can see what i mean more easily.
42 divided by 21 is equal to 2.
this means that 2 * 21 is equal to 42
this means that 21 can be added to 0 for 2 times and the result will be 42.
it also means that 21 can be subtracted from 42 for 2 times and the remainder will be equal to 0.
let's do the multiplication as repeated addition first.
start with 0
add 21 to get 21
add 21 again to get 42
now the division as repeated subtraction next.
start with 42
subtract 21 to get 21
subtract 21 again to get 0
you can do the same thing with 315 / 21, only it takes longer to complete the task.
