2
+16
1
+16
1
+13
5
+12
8
+11
10
+4
5
+2
1
+16
5
+13
1
+2
3
+12
7
+10
10
+4
5
+12
1
+2
1
+12
7
+1
6
+3
7
+1
4
+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 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.