← All Standards

Grade 1

• Measurement & Data

  • 1.MD.C.4

• Number & Operations: Base Ten

  • 1.NBT.C.4
  • 1.NBT.C.6

• Operations & Algebraic Thinking

  • 1.OA.A.1
  • 1.OA.A.2
  • 1.OA.B.3
  • 1.OA.B.4
  • 1.OA.C.5
  • 1.OA.C.6
  • 1.OA.D.7
  • 1.OA.D.8

Arizona Math Standard: 1.OA.D.8

Determine the unknown whole number in an addition or subtraction equation relating three whole numbers (e.g., determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = ? – 3, 6 + 6 = ?).

Adding and Subtracting Fruit

Use super cute fruit to introduce algebraic thinking to your young math students.

Back to School Math Worksheets

In these math problems, the solution is already given. But another number is missing!

Spring Math Worksheets: Addition and Subtraction

Four sets of 2-digit and 3-digit addition and subtraction practice. But the unknown isn’t where you expect it to be!