Find the greatest common factor from the actual factor lists, then divide once.
Numerator · Denominator
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Unlike denominators, with the common denominator found by counting multiples — the step that is normally invisible.
Cancel diagonally first, then multiply straight across. No common denominator needed.
Keep, change, flip — and this one actually shows you why flipping works.
Borrowing a whole one and turning it into fraction pieces. The hardest thing in the fraction unit.