1.AT.A.3: Determine the unknown whole number in an addition or subtraction equation relating three whole numbers (e.g., 8 + ? = 13; 6 = □ – 2; 8 + 8 = □).

Determine the unknown whole number in an addition or subtraction equation relating three whole numbers (e.g., 8 + ? = 13; 6 = □ – 2; 8 + 8 = □).

Example Problems

Solve the equation:

40 = x - 5

Solve the equation:

x - 18 = 3

Solve the equation:

30 = x - 4

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