Integers

Subject: Compulsory Maths

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Overview

Integers are all of the positive and negative whole numbers, and zero. Integers are not fractions or decimal numbers.

Integers

An integer is a number that can be written without a fractional component. For example, 21, 4, 0, and −2048 are integers, while 9.75, 5 1⁄2, and √2 are not.

Addition of Integers

To add two integers with the same signs add their absolute values and select their common sign. For example,

1 + 2 =3, (-1 ) + ( -2) = -3

To add two integers with the opposite signs, take a bigger absolute value, subtract a smaller absolute value and select a sign of bigger absolute. For example,

-3 + 5 = 2, 3 + ( -5 ) = - 2

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Subtraction of Integers

To subtract a positive integer means to add a negative integer. Instead of saying " Nine minus twelve" say "Nine minus Twelve" and then use the rule of adding integers with the opposite signs.

9 - 12 = 9 + ( -12) = -3

Instead of saying " Negative six minus eight" say negative plus negative eight and then use the rule of adding integers with the same signs.

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- 6 -8 = -6 + (-8) = -14

Look at the following example;

a) -8 -12

Translate to addition: ( -8) + (-12)

Add two integers with the same signs: - 20

Thus, - 8 -12 = -20

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Things to remember
  • To add two integers with the same signs add their absolute values and select their common sign.
  • To subtract a positive integer means to add a negative integer. 
  • It includes every relationship which established among the people.
  • There can be more than one community in a society. Community smaller than society.
  • It is a network of social relationships which cannot see or touched.
  • common interests and common objectives are not necessary for society.

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