Fact families to 20
Recall addition facts to 20 and related subtraction facts, and use the commutative property to check calculations. Unlimited questions, five difficulty levels, and a full worked solution every time — free.
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Add.
7 + 9
Answer: 16
See one solved, step by step
What number is missing?
9 + ___ = 13
📘 Worked solution
19 + ___ = 13This is the same fact family as 13 - 9.
2___ = 13 - 9 = 4Subtract 9 from 13 to find the missing number.
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