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  1. Chapter 2 Class 7 Fractions and Decimals
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Adding & Subtracting Unlike FractionsUnlike fractions are those fractions where denominators are different Eg: 1/2, 1/3, 1/5, 1/8 Add ๐Ÿ/๐Ÿ & ๐Ÿ/๐Ÿ‘ We use two methods to solve this Method 1 1/2 + 1/3 = (1 ร— 3 + 1 ร— 2)/(2 ร— 3) = (3 + 2)/6 = 5/6 Method 2 1/2 + 1/3 First, we make denominators same. Common denominator. = LCM of 2 & 3 = 2 ร— 6 = 6 โˆด 1/2 = 1/3 Thus, 1/2 + 1/3 = 3/6 + 2/6 = (3 + 2)/6 = ๐Ÿ“/๐Ÿ” Subtract ๐Ÿ/๐Ÿ & ๐Ÿ/๐Ÿ“ 1/2 โˆ’ 1/5 Method 1 1/2 โˆ’ 1/5 = (1 ร— 5 โˆ’ 1 ร— 2)/(2 ร— 5) = (5 โˆ’ 2)/6 = ๐Ÿ‘/๐Ÿ๐ŸŽ Method 2 1/2 โˆ’ 1/5 Making denominators same. Common denominator. = LCM of 2 & 5 = 2 ร— 5 = 10 โˆด 1/2 1/5 Thus, 1/2 โˆ’ 1/5 = 5/10 โˆ’ 2/10 = (5 โˆ’ 2)/10 = ๐Ÿ‘/๐Ÿ๐ŸŽ

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.