Question

How many bricks are left over if you place 213,854 bricks in groups of 10,000?

Answer 1

This is dividing 213854 by 100000 but instead of giving a decimal you want to give a remainder.

213854/100000 is 2.13854. So you have 2 units, which is 200000.
Subtract 200000 from 213854 and you're left with 13854 bricks that remain.