Missing Minuend or Subtrahend (Within 20)

Practice finding the missing number in subtraction equations — a key Grade 2 skill aligned with Common Core standard 2.OA.B.2.

• Level 1: Find the missing subtrahend (e.g., 15 – ? = 7)
• Level 2: Find the missing minuend (e.g., ? – 6 = 9)

Get instant feedback and build algebraic thinking with these interactive drills — no worksheets, no printing!

💡 Strategy reminder:

• If the first number is missing → add the other two numbers.
• If the second number is missing → subtract the result from the first number.