1
+13
3
+5
1
+5
2
+12
4
+13
1
+6
9
+10
1
+17
8
+1
4
+2
2
+7
1
+13
3
+13
1
+6
7
+1
10
+1
2
+17
10
+1
1
+5
1
+11
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.