# Exam

1.- The decimal number that is equivalent to 3/7 is:

 a) 0.4 b) 0.4242... c) 0.428571428571... d) 0.4285

2.- The fraction that is equivalent to 1.03 is:

 a) 103/10 b) 103/100 c) 10.3/10 d) 103/99

3.- The fraction that is equivalent to 1.0333...   is:

 a) 93/90 b) 103/100 c) 93/99 d) 103/90

4.- Which of the following sentences is true?

 a) All the Natural Numbers are Real Numbers b) π is a Real Number c) There are infinite Real Numbers that are not Rational Numbers d) All of them

5.- The higher approximation of 1/3 to the nearest tenths is:

 a) 0.3 b) 0.4 c) 0.33 d) 0.34

6.- The rounding of 1/3 to the nearest tenths is:

 a) 0.3 b) 0.4 c) 0.33 d) 0.34

7.- The absolute error when we approximate 1/7 by 0.1 is:

 a) 0.042 b) lower than a tenth c) lower than 0.042 d) None of them

8.- The relative error when we approximate 1/7 by 0.1 is:

 a)  lower than 0.3 b) 3% c) 30% d) lower than 30%

9.  1.030.000.000.000.000 in scientific notation is:

 a) 1·1015 b) 1.03·1013 c) 103·1013 d) 1.03·1015

10.      3·109+ 1.02·108  equals (in scientific notation)

 a) 31.02·108 b) 4.02·1017 c) 3.102·109 d) None of them