2
+14
1
+2
3
+10
7
+12
1
+15
10
+10
7
+2
4
+1
1
+17
4
+14
2
+11
1
+1
2
+13
6
+2
10
+2
2
+16
10
+5
9
+10
7
+10
4
+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 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.