Fraction Practice
20 questions · 60 seconds · common denominators
Free · no login · instant feedback on every answer
Build fraction confidence where it should start: adding and subtracting fractions with common denominators. When the bottoms match, only the tops combine — this drill makes that rule automatic before unlike denominators enter the picture.
Fractions are the first topic where many students decide math "stopped making sense," usually because operations were rushed. Twenty quick questions with instant feedback rebuild the pattern — same denominator, add the numerators — until it feels obvious.
Tips That Make It Stick
- Only the tops combine. For 2/5 + 1/5, the denominator stays 5 — it names the piece size. Adding it too (getting /10) is the classic error this drill stamps out.
- Picture the pizza. Two slices of a 6-slice pizza plus three more slices is five slices: 5/6. The denominator never changed because the slices never changed size.
- Simplify at the end. If the answer is 4/6, say it as 2/3. Getting into the simplifying habit early pays off when unlike denominators arrive.
Frequently Asked Questions
Why do you only add the numerators of fractions?
The denominator names the size of the pieces; the numerator counts them. Adding 2/5 + 1/5 is adding 2 pieces to 1 piece of the same size — 3 pieces, so 3/5. The piece size (5ths) never changes.
What grade adds and subtracts fractions?
Fractions with common denominators are a 4th grade skill; unlike denominators follow in 5th grade. Start here, then move to the unlike-denominator worksheets when this drill feels easy.
Can I practice harder fractions?
Yes — load the game and open game settings: turn off "common denominators only" for unlike denominators, raise the difficulty, or switch to mixed-number format.
📝 Matching Printable Worksheets
Prefer paper practice? These free PDF worksheets cover the same skill — each includes an answer key: