About this worksheet
Fourteen subtraction equations within 10, each with one number hidden in a dashed box. Most of the time it sits in the middle (9 − ? = 6), and sometimes it comes first (? − 2 = 7).
The ones that start with the box take the most thought, because that missing number is the biggest in the equation and adding is the quickest way to find it.
A magnifying glass at the top sets up the mystery, which helps a harder kind of problem feel like a puzzle.
What students will practice
- Find the unknown number in a subtraction equation
- Subtract within 10
- Reason about how the numbers in an equation fit together
Details
- Grade level
- Grade 1
- Subject
- Math · Subtraction
- Standard
- CCSS 1.OA.8
- Pages
- 1
- Format
- PDF · US Letter and A4 included
- License
- Free for classroom use · Attribution appreciated
- Last updated
- October 31, 2026
