MATHEMATICS FORM ONE NOTES TOPIC 2:FRACTIONS

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MATHEMATICS FORM ONE NOTES TOPIC 2:FRACTIONS

MATHEMATICS FORM ONE NOTES TOPIC 2:FRACTIONS

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FRACTIONS
A fraction is a number which is expressed in the form of a/b where a – is the top number called numerator and b– is the bottom number called denominator.
A Fraction
Describe a fraction
A fraction is a number which is expressed in the form of a/b where a – is the top number called numerator and b– is the bottom number called denominator.
Consider the diagram below
The shaded part in the diagram above is 1 out of 8, hence mathematically it is written as 1/8
MATHEMATICS FORM ONE NOTES TOPIC 2:FRACTIONS
Example 1
(a) 3 out of 5 ( three-fifths) = 3/5
Example 2
(b) 7 0ut of 8 ( i.e seven-eighths) = 7/8
Example 3
  1. 5/12=(5 X 3)/(12 x 3) =15/36
  2. 3/8 =(3 x 2)/(8 X 2) = 6/16
Dividing the numerator and denominator by the same number (This method is used to simplify the fraction)
Difference between Proper, Improper Fractions and Mixed Numbers
Distinguish proper, improper fractions and mixed numbers
Proper fraction –is a fraction in which the numerator is less than denominator
Example 4
4/5, 1/2, 11/13
Improper fraction -is a fraction whose numerator is greater than the denominator
Example 5
12/7, 4/3, 65/56
Mixed fraction –is a fraction which consist of a whole number and a proper fraction
Example 6
(a) To convert mixed fractions into improper fractions, use the formula below
(b)To convert improper fractions into mixed fractions, divide the numerator by the denominator
MATHEMATICS FORM ONE NOTES TOPIC 2:FRACTIONS
Example 7
Convert the following mixed numbers into improper fractions
MATHEMATICS FORM ONE NOTES TOPIC 2:FRACTIONS
Addition of Fractions
Add fractions
Operations on fractions involves addition, subtraction, multiplication and division
  • Addition and subtraction of fractions is done by putting both fractions under the same denominator and then add or subtract
  • Multiplication of fractions is done by multiplying the numerator of the first fraction with the numerator of the second fraction, and the denominator of the first fraction with the denominator the second fraction.
  • For mixed fractions, convert them first into improper fractions and then multiply
  • Division of fractions is done by taking the first fraction and then multiply with the reciprocal of the second fraction
  • For mixed fractions, convert them first into improper fractions and then divide
Example 11
Find
MATHEMATICS FORM ONE NOTES TOPIC 2:FRACTIONS
Solution
MATHEMATICS FORM ONE NOTES TOPIC 2:FRACTIONS
Subtraction of Fractions
Subtract fractions
Example 12
Evaluate
Solution
MATHEMATICS FORM ONE NOTES TOPIC 2:FRACTIONS
Multiplication of Fractions
Multiply fractions
Example 13
MATHEMATICS FORM ONE NOTES TOPIC 2:FRACTIONS
Division of Fractions
Divide fractions
Example 14
MATHEMATICS FORM ONE NOTES TOPIC 2:FRACTIONS
Mixed Operations on Fractions
Perform mixed operations on fractions
Example 15
MATHEMATICS FORM ONE NOTES TOPIC 2:FRACTIONS
Example 16
MATHEMATICS FORM ONE NOTES TOPIC 2:FRACTIONS
Word Problems Involving Fractions
Solve word problems involving fractions
Example 17
  1. Musa is years old. His father is 3¾times as old as he is. How old is his father?
  2. 1¾of a material are needed to make suit. How many suits can be made from

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