15
-12
17
-7
18
-3
12
-10
16
-5
17
-14
4
-2
7
-2
5
-3
13
-12
20
-10
2
-1
19
-2
9
-4
17
-1
5
-1
9
-8
15
-10
9
-7
7
-3
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.