7
-4
12
-2
4
-2
12
-1
17
-3
14
-13
2
-1
8
-6
4
-1
6
-5
2
-1
15
-2
8
-6
17
-13
5
-4
3
-1
3
-2
5
-4
2
-1
8
-6
Practice subtraction within 20 with free printable worksheets. Uniquely generated — reinforce key math skills with every set.
Frequently Asked Questions
How do I use this Subtraction Within 20 Hard Worksheets worksheet?
Print the worksheet and complete the problems. Each set number generates a unique arrangement. Use the same set number for all students in a class for consistent assessment.
Is there an answer key?
Yes — every worksheet includes a complete answer key. Print it separately or view it on screen.