Number Line (Grade 2)
A number line is a straight line with numbers placed at equal distances along it. It helps us see the order of numbers, compare them, add, and subtract.
In Class 2, we use number lines with numbers up to 200. We learn to find numbers on the line, add by jumping forward, and subtract by jumping backward.
What is Number Line - Class 2 Maths (Numbers up to 200)?
A number line is a line that shows numbers in order from left to right.
- Numbers on the left are smaller
- Numbers on the right are bigger
- Each mark is the same distance apart
0 — 1 — 2 — 3 — 4 — 5 — 6 — 7 — 8 — 9 — 10
Number Line (Grade 2) Formula
Using a number line for addition: Start at the first number and jump forward (to the right) by the second number.
Using a number line for subtraction: Start at the first number and jump backward (to the left) by the second number.
Solved Examples
Example 1: Example 1: Finding a Number
Question: Where is 7 on a number line from 0 to 10?
0 — 1 — 2 — 3 — 4 — 5 — 6 — 7 — 8 — 9 — 10
Answer: 7 is between 6 and 8 on the number line.
Example 2: Example 2: Addition on Number Line
Question: Use the number line to find 4 + 3.
Think:
- Start at 4
- Jump forward 3 steps: 5, 6, 7
0 — 1 — 2 — 3 — 4 → 5 → 6 → 7 — 8 — 9 — 10
Answer: 4 + 3 = 7.
Example 3: Example 3: Subtraction on Number Line
Question: Use the number line to find 9 − 4.
Think:
- Start at 9
- Jump backward 4 steps: 8, 7, 6, 5
0 — 1 — 2 — 3 — 4 — 5 ← 6 ← 7 ← 8 ← 9 — 10
Answer: 9 − 4 = 5.
Example 4: Example 4: Comparing Numbers
Question: Which is bigger, 85 or 78? Use the number line idea.
Think:
- On a number line, 85 comes to the right of 78
- Numbers on the right are bigger
Answer: 85 is bigger than 78.
Example 5: Example 5: Number Between Two Numbers
Question: Ria asks: "What number is exactly between 10 and 20 on the number line?"
Think:
- 10 to 20 is a gap of 10
- Half of 10 = 5
- 10 + 5 = 15
Answer: 15 is exactly between 10 and 20.
Example 6: Example 6: Skip Counting on Number Line
Question: Start at 0 and jump by 10s on the number line. Write the first 5 numbers you land on.
Think:
- 0 + 10 = 10
- 10 + 10 = 20
- 20 + 10 = 30
- 30 + 10 = 40
- 40 + 10 = 50
0 — 10 — 20 — 30 — 40 — 50
Answer: 10, 20, 30, 40, 50.
Example 7: Example 7: Locating Numbers up to 200
Question: On a number line from 100 to 200, where would 150 be?
Think:
- 150 is exactly in the middle of 100 and 200
- It is 50 steps from 100 and 50 steps from 200
100 — — — 150 — — — 200
Answer: 150 is in the middle of 100 and 200.
Key Points to Remember
- A number line shows numbers in order from left (smaller) to right (bigger).
- Addition: Jump forward (right) on the number line.
- Subtraction: Jump backward (left) on the number line.
- A number on the right is always greater than a number on the left.
- Number lines can show numbers up to 200 and beyond.
- Number lines also help with skip counting (by 2s, 5s, 10s).
Practice Problems
- Use a number line to find 6 + 5.
- Use a number line to find 12 − 7.
- Which number is exactly between 30 and 40?
- Start at 5 and make 4 jumps of 10. Where do you land?
- On a number line, which is closer to 100 — 92 or 110?
- Draw a number line from 0 to 20 and mark the numbers 5, 10, and 15.
Frequently Asked Questions
Q1. What is a number line?
A number line is a straight line with numbers placed at equal spaces. Smaller numbers are on the left and bigger numbers are on the right.
Q2. How do I add on a number line?
Start at the first number. Jump forward (to the right) by the number you are adding. The number you land on is the answer.
Q3. How do I subtract on a number line?
Start at the first number. Jump backward (to the left) by the number you are subtracting. The number you land on is the answer.
Q4. How do I compare numbers on a number line?
The number that appears to the right is bigger. The number that appears to the left is smaller.
Q5. Can a number line go beyond 100?
Yes. A number line can show any range of numbers. In Class 2, we use number lines up to 200.
Q6. What is the use of a number line?
Number lines help us see the order of numbers, add, subtract, skip count, and compare numbers easily.
