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Add & subtract to 20: math practice, grades 1–2
Practise “Add & subtract to 20” online for free. Five right answers in a row make the tasks harder, two mistakes in a row make them easier. Right answers earn coins for games.
Example problems
These are only examples: the practice makes new tasks every time.
12 − 1 = ?
Answer
11
11 + 1 = ?
Answer
12
9 + 5 = ?
Answer
14
11 − 8 = ?
Answer
3
11 − 7 = ?
Answer
4
18 − 9 = ?
Answer
9