Missing Number Math Game
Find the number hiding behind the box in each sum.
🎯 How to play
- Look at the sum with a box in it.
- Work out which number belongs in the box.
- Tap your answer and keep going to the next level.
🧠 What children learn
- Inverse operations
- Simple equations such as 7 + ? = 12
- Reasoning about numbers, the first step towards algebra
📈 How the levels get harder
The box starts in easy addition sums within 10 and moves into subtraction, multiplication and division with bigger numbers. Children need 60% right to unlock the next level and can earn up to three stars on each one. Progress is saved on the device, or in a free account made with just a nickname and four secret pictures.
More Math games in Math Mountain
Math Mountain has eight free math games for children aged 4 to 10. Every game starts gently, with counting apples or adding small numbers, and climbs through 10 levels to times tables, fractions, telling the time to five minutes and working out change. Children unlock the next level by getting at least 60% right, so they always practise at a level that suits them. Questions are made fresh each time, so a level can be replayed without simply memorising answers.
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🎲 See all 54 learning games · 🖨️ Free coloring pages · 👩🏫 Guide for teachers & parents