Doubling and Halving Games Online Free
Double numbers up to 50 and halve even numbers up to 100. Split bigger numbers into tens and ones.
Type answers on your keyboard, or tap the number pad.
Practise these again:
How do you double and halve numbers?
To double a number, add it to itself or multiply by 2. For bigger numbers, double the tens and ones separately: double 34 is double 30 (60) plus double 4 (8), which is 68.
Halving is the opposite: half of 68 is 34, because 34 + 34 = 68. Doubles start with small facts like 6 + 6, practised in doubles facts.
How to play Doubling and Halving
- 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.
Doubling and Halving skills
- Doubling numbers to 50
- Halving even numbers to 100
- Splitting numbers into tens and ones
Level: Grades 1–3 (ages 6–9)
Tips for doubling and halving
Split into tens and ones: double 27 → double 20 is 40, double 7 is 14, so 54.
Halve tens and ones too: half of 86 → half of 80 is 40, half of 6 is 3, so 43.
When the tens digit is odd, split differently: half of 70 is 35, so half of 74 is 35 + 2 = 37.
Doubling and Halving questions and answers
How does doubling help with multiplication?
Doubling is the 2 times table, and doubling again gives the 4s and 8s. To work out 4 × 7, double 7 is 14 and double 14 is 28.
What is the doubling and halving strategy?
In multiplication you can double one number and halve the other without changing the answer. 16 × 5 is the same as 8 × 10, which is 80.
What happens when I get one wrong?
For bigger numbers the game shows the tens-and-ones split, for example double 27 = double 20 + double 7 = 40 + 14 = 54.