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Factors and Coprimes 1-2



7. Find the number of factors of 100.
a. 2
b. 5
c. 7
d. 9


8. Find the sum of the factors of 72
a. 152
b. 195
c. 205
d. 216


9. Find the number of ways of writing 140 as a product of two factors
a. 6
b. 9
c. 10
d. 12


10. Find the number of ways of writing 144 as a product of two 'distinct factors'
a. 5
b. 6
c. 7
d. 8


11. Find the number of ways of writing 144 as a product of two factors'
a. 5
b. 6
c. 7
d. 8


12. Find the number of co-primes to 144 which are less than that of it
a. 2
b. 36
c. 48
d. 56