1. Which of these sentences is true:
a) 7 is a multiple of 14
b) 7 is divisible by 14
c) 14 is a factor of 7
d) None of them
2. The factor of 48 are:
a) fact(48) = {1,2,3,4,5,6,8,9,12,16,24,48}
b) fact(48) = {1,2,3,4,6,8,12,16,24,48}
c) fact(48) = {1,2,6,8,24,48}
d) fact(48) = {1,48}
3. lcm(12,18,24) =
a) 36
b) 144
c) 6
d) 72
4. HCF(6,9,12) =
a) 1, they are coprimes
b) 6
c) 3
d) 36
5. |32-42| =
a) 10
b) 74
c) -10
6. Op(57-71) =
a) 14
b) -14
c) 123
d) -123
7. 3-6·(4-2·2)+25:(4-9) =
a) 2
b) -2
c) -5
d) 5
8. (-5)4 =
a) -20
b) -625
c) 20
d) 625
9. Express in scientific notation 3.500.000.000
a) 3.5·109
b) 0.35·1010
c) 35·108
d) All of them
10. The whole square root of 120 is:
a) 11 and the remainder is -1
b) 10 and the remainder is 20
c) 11 and the remainder is 1
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