Beat the clock on quick addition and subtraction. Drag the correct answer into the slot before time runs out, chain correct answers for a streak, and try to beat your own best score.
EDUSAMBAM Editorial Team·Timed · Drag & Drop·Auto-Graded·Last updated: November 2026
Set Up Your Race
Pick which operations to practise, a number range, and a race length, then drag your way through as many questions as you can.
Operation
Number Range
Race Length
No best score yet for this setup — set the first one!
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Correct
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Streak
60
Seconds Left
? + ? = ?
Drag the answer here
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Correct Answers
New Personal Best!
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Best Streak
0%
Accuracy
Mental Maths Tricks: A Quick Guide
Mental maths means working out the answer in your head. Fast players do not add or subtract one digit at a time. They use friendly numbers like 10, 20 and 50, then adjust. In this race you drag the correct answer to the slot, and a wrong answer ends your streak.
Three worked examples
Example 1 · Make a ten
47 + 8: add 3 to reach 50, then add the other 5. 47 + 3 = 50, and 50 + 5 = 55.
Example 2 · Round and adjust
38 + 19: add 20 instead, then take 1 away. 38 + 20 = 58, and 58 − 1 = 57.
Example 3 · Subtract by rounding
63 − 29: take away 30, then give 1 back. 63 − 30 = 33, and 33 + 1 = 34.
Three common mistakes
Forgetting to carry. In 45 + 37, the units give 5 + 7 = 12. Write 2 and carry 1 to the tens: 4 + 3 + 1 = 8, so the answer is 82, not 72.
Subtracting the smaller digit from the larger. In 62 − 28, you cannot do 8 − 2 and call it 6. The answer is 34, not 46. Use rounding: 62 − 30 + 2 = 34.
Dragging too fast. The wrong answer is often 1 or 2 away from the right one. Check the units digit before you drop.
How to use the race
Choose addition, subtraction or mixed, a number range and a race length.
Drag the correct answer chip into the slot. Every 5 correct answers in a row gives a streak bonus message.
When time is up, check your correct answers, best streak and accuracy.
Your best score for each setup is kept on this device. Race again to beat it.