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Home >Math > 2.NBT.B.9 - What is the "Intruder" Number in the Number Association?
2.NBT.B.9 - What is the "Intruder" Number in the Number Association?
This activity requires students to find the "intruder" amongst four associated numbers. For example in the set 7, 15, 4, 8, "4" would be the intruder number because 7, 15, and 8 can be used to form facts together. 4 cannot be combined with two other numbers in the set to produce any facts.