**TOPIC 8: NUMBERS (II) ~ MATHEMATICS FORM 1**

**TOPIC 8: NUMBERS (II) ~ MATHEMATICS FORM 1**

**NUMBERS**

A Rational Number

Define a rational number

A**Rational Number**is a real number that can be written as a simple fraction (i.e. as a**ratio**).

Most numbers we use in everyday life are Rational Numbers.

Number | As a Fraction | Rational? |
---|---|---|

5 | 5/1 | Yes |

1.75 | 7/4 | Yes |

.001 | 1/1000 | Yes |

-0.1 | -1/10 | Yes |

0.111… | 1/9 | Yes |

√2(square root of 2) | ? | NO ! |

The square root of 2 cannot be written as a simple fraction! And there are many more such numbers, and because they are**not rational**they are calledIrrational.

**Addition of Rational Numbers:**

To

add two or morerational numbers, the denominator of all the rational

numbers should be the same. If the denominators of all rational numbers

are same, then you can simply add all the numerators and the denominator

value will the same. If all the denominator values are not the same,

then you have to make the denominator value as same, by multiplying the

numerator and denominator value by a common factor.

Example 1

1⁄3 +1⁄5=5⁄15 +3⁄15 =8⁄15

**Subtraction of Rational Numbers:**

subtract two or more rational numbers, the denominator of all the

rational numbers should be the same. If the denominators of all rational

numbers are same, then you can simply subtract the numerators and the

denominator value will the same. If all the denominator values are not

the same, then you have to make the denominator value as same by

multiplying the numerator and denominator value by a common factor.

numerators and it will be the resulting numerator and multiply all the

denominators and it will be the resulting denominator.

are dividing two rational numbers, then take the reciprocal of the

second rational number and multiply it with the first rational number.

Example 4

4⁄3÷2⁄5=4⁄3×5⁄2=20⁄6=10⁄3

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