There are 8 factors of 40: 1, 2, 4, 5, 8, 10, 20, 40
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Just 7 and 5. * * * * * 7 is not a factor of 40. In fact, 40 has 4 prime factors, not 3. 40 = 23*5
All prime squares have exactly three factors.49 has exactly three factors: 1, 7, and 49.
The factors of 280 are 1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, and 280. The factors pairs are 1*280, 2*140, 4*70, 5*56, 7*40, 8*35, 10*28, 14*20 The prime factors of 280 are 2, 2, 2, 5, and 7.
No. They are a factor pair for 40, since 8 x 5 = 40. They are not factors of 49, so they cannot be a factor pair of 49.
49 has exactly 3 factors (1, 7, and 49) and is greater than 40 and less than 60.