Page 25 - Maths Skill - 6

The Other Side of Zero 23

(ii) On the number line, we start from – 3 and move 4 steps to the right and we reach at 1.

\ 4 more than – 3 is 1.

(iii) On the number line, we start from 2 and move 5 steps to the left and we reach at – 3.

\ 5 less than 2 is – 3.

(iv) On the number line, we start from – 1 and move 2 steps to the left and we reach at – 3.

\ 2 less than – 1 is – 3.

Example 4: Which is greater – 10 or – 110?

Solution: Since – 110 lies left of – 10 on the number line,
\ – 10 is greater than – 110.

Example 5: Arrange the following in increasing order – 7, 7, 0, 10, – 2, – 3, 5 and 12.
Solution: The increasing order is – 7, – 3, – 2, 0, 5, 7, 10, 12.

Example 6: Simplify the following:

(i) | – 8 | + | 8 | (ii) | – 11 | – | – 4 |
Solution: (i) | – 8 | = 8 and | 8 | = 8 (ii) | – 11 | = 11 and | – 4 | = 4

∴ | – 8 | + | 8 | = 8 + 8 = 16. ∴ | – 11 | – | – 4 | = 11 – 4 = 7.

Example 7: Following is the list of temperatures of five places in India on a particular day of the year.
Place Temperature

Siachin 10°C below 0°C ___________
Shimla 2°C below 0°C ___________
Ahmedabad 30°C above 0°C ___________

Delhi 20°C above 0°C ___________
Srinagar 5°C below 0°C ___________

(i) Write the temperatures of these places in the form of integers.
(ii) Following is the number line representing the temperature in degree Celsius. Plot the name of
the city against its temperature.

– 25 – 20 – 15 – 10 – 5 0 5 10 15 20 25 30 35 40
(iii) Which is the coolest place?
(iv) Write the names of the places where the temperature is above 10°C.