3
+15
7
+10
2
+13
1
+17
10
+8
3
+10
5
+13
6
+11
10
+5
1
+17
4
+5
1
+16
2
+16
4
+2
1
+3
2
+13
3
+13
1
+4
4
+2
10
+3
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.