Multiple choice

Which of the following prime numbers appear in the prime factorisation of 1580?

  1. 2, 5, 79

  2. 2, 5, 7, 11

  3. 2, 3, 5, 23

  4. 2, 3, 5, 13
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The prime factorisation of 1580 = 2 $\times$ 2 $\times$ 5 $\times$ 79

 
2 1580
2 790
5 395
79 79
  1

= 22 $\times$ 5 $\times$ 79 So, 2, 5 and 79 appear in the prime factorisation of 1580.

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