This easy sheet introduces first graders to adding within 20 using a number line. Part A gives eight number-line problems where kids draw or trace jumps to find each sum. Part B has five fill-in-the-blank equations, including a missing addend and a number-line landing problem. Part C wraps up with three true-or-false statements about commutativity, adding zero, and basic sums, helping first graders check their reasoning while staying inside friendly numbers.
Style:
Addition Within 20
Part A: Add Using the Number Line
Start at the first number and count on. Write each sum.
3
+2
4
+3
5
+4
2
+6
1
+7
6
+4
3
+5
7
+3
Part B: Fill in the Blank
Read each sentence. Write the missing number on the line.
1. 2 + 5 = 7
2. 4 + 4 = 8
3. If you start at 3 on the number line and jump 6, you land on 9.
4. 6 + 3 = 9
5. 5 + 5 = 10
Part C: True or False
Write True or False for each statement.
1. 3 + 4 is the same as 4 + 3.
True False
2. 5 + 5 = 11.
True False
3. When you add 0 to any number, the answer is that number.
True False
Addition Within 20
★ Part A: Add Using the Number Line
Start at the first number and count on. Write each sum.
3
+2
4
+3
5
+4
2
+6
1
+7
6
+4
3
+5
7
+3
★ Part B: Fill in the Blank
Read each sentence. Write the missing number on the line.
1) 2 + 5 = 7
2) 4 + 4 = 8
3) If you start at 3 on the number line and jump 6, you land on 9.
4) 6 + 3 = 9
5) 5 + 5 = 10
★ Part C: True or False
Write True or False for each statement.
1) 3 + 4 is the same as 4 + 3.
True
False
2) 5 + 5 = 11.
True
False
3) When you add 0 to any number, the answer is that number.
True
False
Ready to Practice?
Use the number line to add. Write the answer on the line. Then answer the questions below.
16 Questions
15-20 minutes
Auto-graded
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