Page 27 - Revised Maths Wisdom Class - 6
P. 27
The Other Side of Zero 25
9. Write the next three integers for the following sequences:
(a) –15, –12, –9, –6, ___, ___, ___ (b) –1, 3, 7, 11, ___, ___, ___
10. Following is the list of temperature of five places in India on a particular day of the year:
(a) Write the temperature of these places Place Temperature
in integers. Delhi 24°C above 0°C
(b) Which is the coldest place? Manali 7°C below 0°C
(c) Write the names of the places where
the temperature is above 5°C. Jaipur 30°C above 0°C
Srinagar 4°C below 0°C
Ladakh 14°C below 0°C
Operations on Integers
As we add, subtract, multiply or divide the whole numbers, the same can be done with integers. Let us see how
we add two or more integers.
Addition of Integers
Rules for Addition of Integers
Rule 1: If two positive or negative integers are added, we add their magnitudes (absolute value) and give
common sign to their sum.
e.g., 37 + 23 = 60 or (–37) + (–23) = – 60
Rule 2: To add a positive and a negative integer, first we find the difference between the two and give the sign
of the integer which has greater numerical value.
e.g., –46 + 20 = (–26) as integer with negative sign has greater numerical value.
or 46 + (–20) = 46 + (–20) = 26 as integer with positive sign has greater numerical value.
Rememb
Remember!er!
When a positive integer is added to an integer, the resulting integer is greater than the given integer.
When a negative integer is added to an integer, the resulting integer is smaller than the given integer.
Numbers such as –7 and +7, +9 and –9 when added to each other give the sum zero. They are called additive inverse of
each other.
Addition of Integers on Number Line
● While adding positive integer to positive integer move towards right on the number line. For example,
3 + 5 = 8
–8 –7 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7 8
● While adding positive integer and negative integer we move towards left. For example 6 + (–4) = 2
–8 –7 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7 8
