Missing Number Addition
Free printable missing-number addition worksheets with an answer key. Solve equations like 7 + ▢ = 12 by finding the missing number. Choose the range and problem count, then print or download the PDF — great for early math.
Type the missing number in each box — you'll see a ✓ when it's right.
Explore the Elementary Math & Number Sense Sequence
A structured progression following the Concrete-Pictorial-Abstract (CPA) framework — from part-whole number bonds to inverse operations, multi-digit arithmetic, and algebraic functions.
Missing Numbers
Equation balance like 7 + ▢ = 12
Learn How to Play, Solve & Teach Missing Number Addition
Missing Number Worksheets: Why They Work (and How to Use Them)
Missing number problems like 7 + ▢ = 12 build real number sense and teach kids that addition and subtraction are two sides of the same fact. Learn why they work and generate free printable missing-number worksheets with an answer key.
Frequently asked questions
What is a missing number worksheet?+
It's a set of equations with one number left blank — like 7 + ▢ = 12 — and the solver works out the missing value. It builds number sense and reinforces the link between addition and subtraction (and multiplication and division).
Which operations are available?+
Addition, subtraction, multiplication, and division — individually or mixed. The blank can appear in any position (first number, second number, or the answer).
Are the worksheets free to print?+
Yes. Generate unlimited worksheets and print or download them as a PDF for free — no signup. Each PDF includes the worksheet and a separate answer key.
Can I control the difficulty?+
Yes. Choose the number range (up to 10, 12, 20, 50, or 100) and how many problems appear (10–40), so you can match the sheet to any grade level.
Do the subtraction and division problems stay clean?+
Yes. Subtraction never produces a negative result and division always divides evenly, so every missing number is a whole number.
Is every worksheet different?+
Yes. Press New sheet for a fresh set of equations, so you can print a whole stack of unique practice sheets.