Mental math to 20
Use mental strategies — doubles, near doubles, and making ten — to add and subtract within 20. Unlimited questions, five difficulty levels, and a full worked solution every time — free.
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Add.
2 + 2
Answer: 4
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Add.
6 + 7
📘 Worked solution
16 + 7 = 6 + 6 + 17 is one more than 6, so this is a near-double.
2= 12 + 1 = 13Double 6 first, then add 1 more.
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