This activity is placed under dry-erase plastic and used all week.
Students look through each family and fill in the missing blanks. Although each family looks as if it contains all matching number sentences, there is a phony in each group. When the students find the phony, they mark 1 line through it.
This gets students thinking more in depth and trying to solve each number sentence instead of simply trying to fill in the number sentence with the one missing number from the family that hasn't been used yet.
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I will be adding more free and paid content every week this school year after I test it out on my own students. :)