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.
This answer to this problem is 1890
1/8+1/3. The denominator is changed to 24. 1/8 will turn to 3/24 and 1/3 will turn to 8/24. 3/24+8/24= 11/24.
Only one piece of this particular length can be cut with 8.5 pieces remaining