1
+17
1
+1
5
+1
2
+10
9
+10
1
+14
6
+10
10
+5
4
+4
4
+10
1
+11
5
+12
5
+3
3
+3
5
+3
10
+9
3
+4
5
+10
3
+16
2
+7
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.