5
+1
10
+1
2
+13
10
+6
10
+5
4
+13
4
+14
5
+12
4
+12
4
+12
6
+2
1
+10
2
+17
3
+13
3
+16
1
+10
5
+11
7
+11
4
+12
7
+10
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.