Skip to calculator content
9×GooGooCalc⌕

Adding & Subtracting Fractions

Unlike denominators, with the common denominator found by counting multiples — the step that is normally invisible.

First numerator · First denominator · Second numerator · Second denominator

Related calculators

Grades 5–6

Multiplying Fractions

Cancel diagonally first, then multiply straight across. No common denominator needed.

Grades 5–6

Dividing Fractions

Keep, change, flip — and this one actually shows you why flipping works.

Grades 4–6

Subtracting Mixed Numbers

Borrowing a whole one and turning it into fraction pieces. The hardest thing in the fraction unit.

Grades 4–5

Simplifying Fractions

Find the greatest common factor from the actual factor lists, then divide once.