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Factors, Multiples & Primes

Factors, Multiples & Primes

What is the correct answer to each of these questions? You will probably want some paper to work out on.

1. (a) Sum of the first six prime numbers

(b) LCM of 5 and 8  
(c) Sum of both square numbers between 10 and 30
2. (a)

Sum of all prime numbers less than 10
(b) HCF of 56 and 70
(c) Sum of the first three square numbers  
3. (a) Sum of both prime numbers between 15 and 20
(b) LCM of 12 and 9
(c)

Sum of the 3rd and 5th square numbers

  
4. (a) Difference between both prime numbers between 30 and 40

(b) HCF of 36, 42 and 54
(c) Difference between the 4th and the 3rd square numbers  
5. (a) Sum of the nearest two prime numbers to 30

(b) LCM of 6, 9 and 27
(c) Sum of all square numbers which are greater than 1 but less than 30  
6. (a) Sum of all the prime numbers between 20 and 40

(b) LCM of 8, 15 and 20
(c) Sum of all the square numbers between 15 and 50
7. (a) Product of the 1st and 4th prime numbers

(b) HCF of 60, 90 and 105
(c) Difference between the 8th and the 7th square numbers
8. (a) Sum of the first three prime numbers that end with a 7

(b) LCM of 15, 20 and 30
(c) Difference between the first two square numbers that end with a 4

9.

 (a)

Product of the highest prime number which is less than 30 and the only even prime number
(b) LCM of 7, 8 and 14
(c) Sum of the first two square numbers that end with a 9
10. (a) Difference between the highest prime number which is less than 40 and the lowest one which is greater than 20

(b) HCF of 80, 96 and 144
(c) Difference between the 5th and the 3rd square numbers
If you make any mistakes, try again!
 

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