The Rule
The rule is simple, but applying it correctly under the pressure of a high-score streak builds the automatic fluency kids need for more advanced math. Math Cards generates new problems every run so kids can't rely on memory.
Difficulty Levels
Small fractions
Simple numerators and denominators. Products are easy to simplify after flipping.
Moderate values
Larger fractions where the reciprocal multiplication creates a product that needs careful simplifying.
Complex quotients
Large numerators and denominators — non-obvious GCFs in the final product.
Practice Alongside Multiplication
Division and multiplication of fractions are inverse operations. Practicing both together deepens understanding — a child who understands why "flip and multiply" works will handle both operations confidently. Math Cards keeps each mode separate so the skill is drilled cleanly before mixing them.
Practice Dividing Fractions
20 free problems per day. Unlimited with a one-time $9.99 unlock.