Mathematics · Grades 3–5
Fractions · Formula sheet
Rules, conditions and small examples in one printable reference.
Remember this
Fractions of a set
Split into equal groups using the denominator, then take the numerator groups.
(a/b) × N = a × (N ÷ b)
136 ÷ 8 × 4 = 68
Complete one whole
Keep the common denominator while finding the missing numerator.
a/b + (b − a)/b = 1
17/20 + 3/20 = 20/20 = 1
Subtract mixed numbers
Convert to improper fractions; then subtract with a common denominator.
w a/b = (wb + a)/b
(29 − 22)/4 = 7/4
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
Learning preview · teacher review required. Grade bands are approximate, not official curriculum alignment.