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