Use these worksheets and games to introduce and practice addition equations with an unknown number. It is all aligned with CCSS Math.Content.1.OA.D.8: Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.
4 different worksheet designs with answer key: 2 pages with addition under 10 and 2 pages with addition under 20
3 sorting games with 18 different cards
24 task cards and a recording sheet: can be used for Scoot, a write-the-room activity or as a task cards center
***Check out Unknown Numbers Subtraction Equations 1.OA.8
for the subtraction version of this product.