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Comparing unlike fractions - Part 2
Comparing unlike fractions - Part 3
Comparing unlike fractions - Part 4
Comparing unlike fractions - Part 5

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Transcript

Comparing unlike fractionsUnlike fractions are those fractions where denominators are different. Eg : 1/2, 1/3, 1/5, 1/8 are like fractions Compare 2/3 & 3/4 Since they don’t have same denominator, we try to make denominator same. Common denominator = L.C.M of 3 & 4 = 2 × 2 × 3 = 12 2 3, 4 2 3, 2 3 3, 1 1, 1 So, 2/3 = 2/3 × 4/4= 8/12 3/4 =3/4 × 3/3= 9/12 Since, 9/12 > 8/12 ∴ 3/4 > 2/3 Compare 12/42 & 15/45 Here, 42, 45 are big numbers, we try to make it smaller 12/42 ÷ 2 ÷ 2 = 6/21 3 = 2/7 15/45 ÷ 3 ÷ 3 = 5/15 5 5 = 1/3 So, we have to compare 2/7 & 1/3 Since they don’t have the same denominator, We try to make denominator’s same Common denominator = L.C.M of 7 & 3 = 7 × 3 = 21 So, 2/7 = 2/7 × 3/3× = 6/21 1/3 = 1/3 x 7/7 = 6/21 since, 7/21 > 6/21 Hence, 1/3 > 2/7 ∴ 𝟏𝟓/𝟒𝟓 > 𝟏𝟐/𝟒𝟐

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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 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.