Line up your decimals and add an extra zero so that there’s 3 numbers after 33 and 21. 0-3 isn’t possible so you would take 1 away from 5 which leaves you with 4.
10-3=7
4-6 wouldn’t be possible so you take 1 away from 2 and it gives you 14 since you add the 1 before the 4
14-6=8
1-4 isn’t possible as well so take 1 away from 3 and you would get 11.
11-4=7
2-1=1 3-2=1
(Note: when you take 1 away from a number. It’s suppose to be taken away from the number in front of the number that needs the 1)
