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Using the unmarked number line to add and subtract
Last updated at July 25, 2026 by Teachoo
Using the unmarked number line to add and subtract
Class 6 (Ganita Prakash & Old NCERT)
Chapter 10 Class 6 - The other side of Zero (Ganita Prakash)
- Bela's Building of Fun
- Integers - Definition
- Addition of Integers
- Inverse of an Integer
- Comparing Integers
- Figure it out - Page 247
- Subtraction of Integers
- Adding and Subtracting Larger Numbers
- Adding and Subtracting Integers using Number line
- Figure it out - Page 253, 254
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Using the unmarked number line to add and subtract
- Token Model
- Figure it out - Page 259
- Credit and Debit
- Geographical cross sections
- Temperature
- Hollow Integer Grid
- Amazing Grid
- Figure it out - Page 265, 266
Transcript
Using the unmarked number line to add and subtractWe can use the unmarked number line to add & subtract We use these rules For positive numbers, we go to the right For negative numbers, we go to the left In our calculations, we need to have a plus sign in the middle Example: For (–2) – (+3), we write (–2) + (–3) Solve 85 + (– 60) on number line 85 + (–60) Since 85 is positive, we mark 85 to the right of zero And since 5 positive, we move 5 steps to the right we reach 25 Thus, 85 + (–60) = 85 – 60 = 25 Solve (–100) – (+250) on number line (–100) – (+250) = (–100) + (–250) Since (–100) is negative, we mark (–100) to the left of zero And since (–250) is negative, we mark (–250) to the left we reach (–350) Thus, (–100) – (+250) = (–100) + (–250) = –100 – 250 Taking – common = – (100 + 250) = – 350
