Two-Digit Subtraction Game
Subtract a two-digit number from a larger one under 100, such as 72 − 38. Some questions need regrouping.
Type answers on your keyboard, or tap the number pad.
Practise these again:
How to play
- Choose the 60-second challenge or untimed practice, then press Start.
- Type each answer on your keyboard or tap the number pad. It’s checked as soon as you’ve typed enough digits, or press ✓.
- Get one wrong and you’ll see the right answer, and the question comes back a little later.
- At the end, check your score and the facts to practise again.
What it practises
- Subtracting two-digit numbers within 100
- Mental subtraction strategies
- Regrouping (borrowing)
Level: Grades 2–3 (ages 7–9)
Tips for two-digit subtraction
Round and adjust: 72 − 38 = 72 − 40 + 2 = 34.
Count up when the numbers are close: for 61 − 57, count 57 → 60 (3) → 61 (1), so the answer is 4.
Questions and answers
What is regrouping in subtraction?
Regrouping (also called borrowing) is needed when the ones digit you’re taking away is bigger. In 72 − 38, you can’t take 8 from 2, so one ten becomes ten ones: 12 − 8 = 4.
What’s the best mental strategy?
It depends on the numbers. Rounding works well when you’re taking away a number close to a ten (like 49), and counting up works well when the two numbers are close together.
How big are the numbers in this game?
You start from a number between 20 and 99 and take away a number between 10 and that number, so answers are never below zero.