4
+15
2
+5
1
+4
4
+11
4
+14
7
+10
10
+2
4
+10
5
+14
10
+3
3
+6
5
+4
1
+8
2
+10
2
+16
3
+16
6
+1
8
+11
5
+1
7
+2
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.