1
+10
10
+4
3
+16
4
+15
3
+16
1
+16
8
+10
4
+2
6
+1
6
+11
2
+15
7
+1
5
+1
5
+13
4
+2
5
+1
4
+14
4
+2
1
+17
5
+4
Practice addition within 20 with free printable worksheets. Uniquely generated — reinforce key math skills with every set.
Frequently Asked Questions
How do I use this Addition 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.