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) 3.5·10^{9}

b) 0.35·10^{10}

c) 35·10^{8}

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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