Ex 2.5

Chapter 2 Class 7 Fractions and Decimals
Serial order wise

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Transcript

Ex 2.5, 8 Shyama bought 5 kg 300 g apples and 3 kg 250 g mangoes. Sarala bought 4 kg 800 g oranges and 4 kg 150 g bananas. Who bought more fruits?Shyama Weight of apples = 5 kg 300 g Weight of mangoes = 3 kg 250 g Total weight = 5 kg 300 g + 3 kg 250 g = (5 kg + 300 g) + (3 kg + 250 g) = (5 kg + 3 kg) + (300 g + 250 g) = 8 kg + 550 g = 8 kg + 550 × 1 g Sarala Weight of oranges = 4 kg 800 g Weight of bananas = 4 kg 150 g Total weight = 4 kg 800 g + 4 kg 150 g = (4 kg + 800 g) + (4 kg + 150 g) = (4 kg + 4 kg) + (800 g + 150 g) = 8 kg + 950 g = 8 kg + 950 × 1 g 1000 g = 1 kg 1 g = 1/1000 kg = 8 kg + 550 × 1/1000 kg = (8+550/1000) kg = ((8 × 1000 + 550)/1000) kg = ((8000 + 550)/1000) kg = 8550/1000 kg = 8.550 kg 1000 g = 1 kg 1 g = 1/1000 kg = 8 kg + 950 × 1/1000 kg = (8+950/1000) kg = ((8 × 1000 + 950)/1000) kg = ((8000 + 950)/1000) kg = 8950/1000 kg = 8.950 kg We need to find who bought more fruits So, we need to find greater of 8.550 kg & 8.950 kg Comparing digits before decimal point 8 = 8 So we compare digits after decimal point 5 < 9 So, 8.550 < 8.950 ∴ Sarala brought more fruits

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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.