Group in to twos (starting from the right)
Same idea applies to subtraction, what's easier to think about, 15528-1210 or:
1 55 28- 12 10 1 43 18
It's easier to think “28-10=18” and “55-12=43”
Carries still apply as normal:
4812 - 1598
48 12 -15 98 32 14 A bit like school, 12 – 98, make it 112 – 98 = 14 carry one 1
Do 48-15 then subtract one, 48-15=33, 33 – 1 = 32
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