3
+16
8
+11
3
+2
4
+14
10
+4
10
+8
1
+4
6
+2
4
+15
10
+4
2
+13
3
+5
6
+12
10
+3
10
+8
4
+1
4
+4
4
+1
1
+17
2
+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.