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Ex 1.2, 8 -  A student multiplied 7236 by 65 instead of multiplying 56

Ex 1.2, 8 - Chapter 1 Class 6 Knowing our Numbers - Part 2

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Ex 1.2, 8 - Chapter 1 Class 6 Knowing our Numbers - Part 3

Ex 1.2, 8 - Chapter 1 Class 6 Knowing our Numbers - Part 4

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This video is only available for Teachoo black users

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Transcript

Ex 1.2, 8 (Method 1) A student multiplied 7236 by 65 instead of multiplying by 56. By how much was his answer greater than the correct answer? (Hint: Do you need to do both the multiplications?) Wrong multiplication = 7236 × 65 Right multiplication = 7236 × 56 Difference between both answers = 7236 × 65 − 7236 × 56 Taking 7236 common = 7236 × (65 − 56) = 7236 × 9 So, wrong answer was greater than right answer by 65,124. Ex 1.2, 8 (Method 2) A student multiplied 7236 by 65 instead of multiplying by 56. By how much was his answer greater than the correct answer? (Hint: Do you need to do both the multiplications?)Wrong multiplication = 7236 × 65 Difference between wrong answer and right answer = 4,70,340 − 4,05,216 So, wrong answer was greater than right answer by 65,124.

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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.