52 Task cards Missing Addend sums to 20
Enough cards for two centers
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Students can self check their work
The 52 task cards have a brown border; the cards with the blue border can be put on a ring in order so students can easily self-check their work
The first set of 26 cards has an upper case letter in the bottom right corner; the second set of 26 cards has a lower case letter in the bottom right corner.
2 answer sheets are included
Determine the unknown whole number in an addition equation relating three whole numbers. For example, determine the unknown number that makes the equation true 8 + ? = 11