420
420 ÷ 10 = 42
42*10 = 420 16*1 = 16 420+16 = 436.
420
420
420 - 42 = 378
42 is 10% of 420.
420
Just divide 4.20 by 42, to find out.
7
you would take the answer 420 and split in half
5 is half of 10 so the answer will be half of 420, which is 210.