2
+13
10
+7
2
+10
2
+2
1
+3
10
+4
5
+12
10
+7
4
+5
2
+2
7
+12
4
+11
3
+6
10
+9
6
+2
2
+16
6
+11
7
+1
3
+12
2
+1
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.