This math topic focuses on finding missing values in addition equations involving two-digit numbers. Learners practice solving problems where either addend or the sum is unknown. Examples include equations like "71 + ? = 157" and "? + 73 = 153." The equations belong to a broader unit on the addition and subtraction of integers using one and two-digit numbers. Each question offers multiple-choice answers to assess understanding and strengthen integer operation skills.
Work on practice problems directly here, or download the printable pdf worksheet to practice offline.
Complete these online problems with 80% or 4 correct answers in a row. Results are immediate.
Solve for the missing value