10
+3
2
+13
2
+6
10
+9
1
+11
3
+13
2
+5
10
+3
3
+13
7
+12
2
+17
1
+5
6
+1
1
+6
10
+7
3
+11
10
+10
2
+14
1
+2
2
+4
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.