4
+1
10
+5
1
+12
5
+11
10
+6
2
+4
5
+14
1
+14
3
+16
6
+10
4
+2
5
+14
10
+9
1
+5
8
+1
10
+3
1
+7
1
+14
10
+1
10
+5
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.