Unlike fractions are those fractions where denominators are different

 

Eg: 1/2, 1/3, 1/5, 1/8

 

Add 1/2 & 1/3

We use two methods to solve this

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Subtract 1/2 & 1/5

            1/2 − 1/5

Addition and Subtraction of Unlike Fractions - Part 2

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Transcript

Adding & Subtracting Unlike FractionsUnlike fractions are those fractions where denominators are different Eg: 1/2, 1/3, 1/5, 1/8 Add 𝟏/𝟐 & 𝟏/𝟑 We use two methods to solve this Method 1 1/2 + 1/3 = (1 × 3 + 1 × 2)/(2 × 3) = (3 + 2)/6 = 5/6 Method 2 1/2 + 1/3 First, we make denominators same. Common denominator. = LCM of 2 & 3 = 2 × 6 = 6 ∴ 1/2 = 1/3 Thus, 1/2 + 1/3 = 3/6 + 2/6 = (3 + 2)/6 = 𝟓/𝟔 Subtract 𝟏/𝟐 & 𝟏/𝟓 1/2 − 1/5 Method 1 1/2 − 1/5 = (1 × 5 − 1 × 2)/(2 × 5) = (5 − 2)/6 = 𝟑/𝟏𝟎 Method 2 1/2 − 1/5 Making denominators same. Common denominator. = LCM of 2 & 5 = 2 × 5 = 10 ∴ 1/2 1/5 Thus, 1/2 − 1/5 = 5/10 − 2/10 = (5 − 2)/10 = 𝟑/𝟏𝟎

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.