How does Guess the Fraction work?

A fraction _/d = value is shown with the numerator missing. Pick the correct missing numerator from 4 options before the timer runs out.

What do the difficulty levels change?

Easy uses simple denominators like 2, 4, 5, 10. Medium adds 3, 8, 20. Hard uses trickier denominators like 7, 9, 11, 15, 25.

What keyboard shortcuts work?

Press 1, 2, 3, or 4 to instantly select the corresponding answer option.

Guess the Fraction — Find the Missing Numerator, Fraction Practice Game

🍕

Guess the Fraction

A fraction with a missing numerator is shown with its decimal value.
e.g. _ / 4 = 0.5 → answer is 2
Pick the correct missing number from 4 options!
Keys 1 2 3 4 or tap. +10 correct · −5 wrong · speed bonus up to +8

How to use

Choose a difficulty (Easy / Medium / Hard) — harder levels use trickier denominators.
Hit ▶ Start Game. Each question shows _ / d = decimal with the numerator missing.
Calculate: multiply the decimal by the denominator to find the missing numerator.
Tap the correct answer or press keys 1 2 3 4 before time runs out.
Review any missed fractions after the game and use ↩ Change Difficulty to step up.

Frequently Asked Questions

How do I find the missing numerator?

Multiply the decimal value by the denominator. For example, _ / 4 = 0.5 → 0.5 × 4 = 2. The answer is 2.

What denominators appear on each difficulty?

Easy: 2, 4, 5, 10. Medium adds 3, 8, 20. Hard uses 3, 6, 7, 8, 9, 11, 12, 15, 16, 25 — these produce non-terminating or long decimals.

How does the speed bonus work?

You earn 1 bonus point per second remaining when correct. On a 10-second timer, answering instantly earns up to 9 bonus points on top of the base points.

Can the decimal have more than 4 places?

No — decimals are displayed to a maximum of 4 significant decimal places with trailing zeros stripped. For example, 1/3 appears as 0.3333.

Where is my high score stored?

Scores are saved in your browser's localStorage and persist between visits on the same device and browser profile.

Did you know?

Every fraction a/b (where b ≠ 0) converts to either a terminating or a repeating decimal — there are no other possibilities.
1/7 = 0.142857142857… — the six digits 142857 repeat forever. Multiply 142857 by any number 1–6 and you get a cyclic permutation of the same six digits.
Ancient Egyptians used only unit fractions (numerator = 1) — they would write 3/4 as 1/2 + 1/4. Their fraction notation dates back to at least 1800 BC.

Guess the Fraction

Well done!

How to use

Frequently Asked Questions

Did you know?

Related tools

Guess the Fraction

Well done!

How to use

Frequently Asked Questions

Did you know?

Related tools

⚙ Settings