This medium worksheet teaches the powerful making-ten strategy, where kindergartners learn to break apart numbers to make a friendly ten first, such as solving 9+4 by thinking 9+1+3. Part A presents twelve equation problems using sums up to 20. Part B challenges learners with six missing-number puzzles like 9 plus blank equals 13, pushing them to apply making-ten thinking flexibly.
This strategy is essential preparation for first grade addition and builds strong mental math habits.
Style:
Addition within 20
Part A: Solve the Addition Problems
Add the numbers. Write the answer on the line.
9
+3
8
+5
7
+6
9
+5
8
+7
9
+6
7
+9
8
+6
9
+8
6
+5
9
+7
8
+4
Part B: Fill in the Missing Number
Write the missing number to complete each number sentence.
1. 9 + 4 = 13
2. 7 + 8 = 15
3. 10 + 7 = 17
4. 10 + 6 = 16
5. 9 + 10 = 19
6. 10 + 8 = 18
Addition within 20
★ Part A: Solve the Addition Problems
Add the numbers. Write the answer on the line.
9
+3
8
+5
7
+6
9
+5
8
+7
9
+6
7
+9
8
+6
9
+8
6
+5
9
+7
8
+4
★ Part B: Fill in the Missing Number
Write the missing number to complete each number sentence.
1) 9 + 4 = 13
2) 7 + 8 = 15
3) 10 + 7 = 17
4) 10 + 6 = 16
5) 9 + 10 = 19
6) 10 + 8 = 18
Ready to Practice?
For Part A, add the numbers. For Part B, write the missing number.
18 Questions
15-20 minutes
Auto-graded
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