Dividing three digit numbers by multiples of ten may be a bit more challenging for you. Let's look at a few examples:
456 / 50 = 9 r6
Let's check that:
50 x 9 + 6 = 456
So, we can get 9 50s out of 456 with 6 left over.
377 / 40 = 9 r 17
To check that we just multiply and add like this:
40 x 9 + 17 = 377
We could count by 40s if we really wanted to until the last
multiple of 40 that's less than 377 and then subtract:
40, 80, 120, 160, 200, 240, 280, 320, 360. (that's 9 multiples)
377 - 360 = 17 (that's our remainder)
892 / 80 = 11 r12
Check with multiplication and addition:
80 x 11 + 12 = 892
Counting multiples and subtracting:
80, 160, 240, 320, 400, 480, 560, 640, 720, 800, 880. (that's 11)
892 - 880 = 12