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Addition and subtraction within 20

Level up on the above skills and collect up to 300 Mastery points
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Equal signGet 5 of 7 questions to level up!
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Find missing number (add and subtract within 20)Get 5 of 7 questions to level up!
Level up on the above skills and collect up to 200 Mastery points
Level up on the above skills and collect up to 400 Mastery points
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Level up on all the skills in this unit and collect up to 1000 Mastery points!

About this unit

Learn to add and subtract numbers that are 20 or less.