1
+15
1
+4
4
+5
3
+13
10
+4
3
+5
5
+10
3
+15
1
+7
2
+16
3
+13
10
+10
3
+11
1
+13
8
+11
3
+5
1
+13
1
+8
2
+17
1
+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.