Find the pair – fractions, percentages and decimals
Match the cards that mean the same number. There is no time limit and no points are taken off – if a pair is wrong, you will see what each card really is.
How do you play?
Choose a card from the left column, then a card from the right column that means the same number. For example, 1/4, 0,25 and 25% are the same number: one of four equal parts. If you choose a wrong pair, you will see what each card really is. There is no time limit.
In Poland decimals are written with a comma: 0,25 means 0.25. The game uses the Polish way, as in school and in the exam. The Polish eighth-grade exam is called egzamin ósmoklasisty.
How do you turn a fraction into a percentage?
A percentage is a hundredth. Write an equivalent fraction with denominator 100: 3/4 = 75/100 = 75%. If that is not possible, divide the numerator by the denominator and multiply by 100: 1/8 = 0,125 = 12,5%. Fraction to decimal: divide the numerator by the denominator, 2/5 = 2 : 5 = 0,4.
Which pairs are worth knowing by heart?
1/2 = 0,5 = 50% · 1/4 = 0,25 = 25% · 3/4 = 0,75 = 75% · 1/5 = 0,2 = 20% · 1/10 = 0,1 = 10% · 1/8 = 0,125 = 12,5%. They help with percentage problems, with fractions and when you compare numbers.
What is the most common mistake?
Copying the digits instead of converting: 1/8 is not 0,8 and not 8%. 1/8 is one of eight parts, which is 0,125, which is 12,5%. A picture helps: a strip of eight squares with one of them shaded.
How does this help in the eighth-grade exam?
In the Polish eighth-grade exam you need to switch quickly between fractions and percentages. In 2025, question 1 – what percentage of the number b is the number a – was answered correctly by 59% of pupils. In 2026 the same skill was tested in open question 17: the success rate was 65%, and almost 52% of pupils gave a full solution. The game reinforces the most common pairs.
Curriculum: points IV.8, IV.9 and XII.1 for grades 4–6 and V.1 for grades 7–8 (Polish core curriculum, Dz.U. 2024 poz. 996). Sources: CKE report 2025; CKE report 2026 (in Polish).
Questions about the game
What percentage is 3/4?
75%, because 3/4 = 75/100 = 0,75.
Do I lose points for a wrong pair?
No. No points are taken off and there is no time limit – for a wrong pair you will see what each card means.
Is the game free?
Yes. You play in the browser on a phone or a computer, with no sign-up and no e-mail.
Mini glossary: English – Polish
- fraction – ułamek zwykły
- decimal – ułamek dziesiętny, liczba dziesiętna
- percentage – procent
- numerator – licznik
- denominator – mianownik
- pair – para
The game runs in your browser. There is no time limit, no points are taken off, and we save nothing.