4
+3
3
+15
4
+15
8
+1
7
+1
5
+3
4
+10
2
+6
2
+3
7
+11
4
+1
1
+17
8
+10
4
+5
10
+7
3
+11
10
+6
1
+12
1
+15
2
+5
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.