Number Bonds to 100 Games Online Free
Find the number that makes 100, like 35 + □ = 100. The tens make 90 and the ones make 10.
Type answers on your keyboard, or tap the number pad.
Practise these again:
What are number bonds to 100?
Number bonds to 100 are pairs that add up to 100, like 35 and 65 or 72 and 28. Pairs of tens, like 30 + 70, come from the bonds to 10.
For other numbers, the ones make 10 and the tens make 90. In 35 + 65, 5 + 5 = 10 and 30 + 60 = 90. If bonds to 10 still need work, practise make ten first.
How to play Number Bonds to 100
- 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.
Number Bonds to 100 skills
- Pairs of numbers that make 100
- Using bonds to 10 with tens and ones
- Mental addition and subtraction from 100
Level: Grades 2–3 (ages 7–9)
Tips for number bonds to 100
Ones to 10, tens to 9: for 46 + □, the ones need 4 (6 + 4 = 10) and the tens need 5 (4 + 5 = 9). The answer is 54.
Multiples of 10 are just bonds to 10 with a zero: 30 + 70 = 100 because 3 + 7 = 10.
Count up in two jumps: 46 → 50 (4) → 100 (50). 4 + 50 = 54.
Number Bonds to 100 questions and answers
Why don’t the tens add up to 10?
Because the ones make an extra ten. In 46 + 54, 6 + 4 = 10 carries a ten, so the tens only need to make 90.
What year group learns number bonds to 100?
In England, Year 2 learns bonds to 100 with multiples of ten, and Year 3 and 4 work with any two-digit number. In the US it fits second and third grade.
Does the game include every pair?
Yes, every number from 1 to 99 comes up, so it covers easy pairs like 50 + 50 and harder ones like 37 + 63.