9
-1
15
-12
5
-2
13
-11
2
-1
13
-10
18
-5
8
-4
12
-1
4
-1
2
-1
18
-4
8
-5
2
-1
8
-1
6
-3
2
-1
4
-1
14
-13
2
-1
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.