The factors of 20 are 1, 2, 4, 5, 10, and 20. The factors of 28 are 1, 2, 4, 7, 14, and 28. Their common factors are 1, 2, and 4.
Class 6 Mathematics Chapter 5 Prime Time question answer
Class 6 NCERT Ganita Prakash Chapter 5 Prime Time
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To determine the common factors of 20 and 28, list their factors. For 20, the factors are 1, 2, 4, 5, 10, and 20. For 28, the factors are 1, 2, 4, 7, 14, and 28. Comparing these, the common factors are 1, 2, and 4. These shared divisors show the numbers’ overlap, with 4 being the greatest common divisor (GCD) and thus the largest number that divides both evenly.
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