¡¡¡¡1¡¢Did you know? In the decimal number system (base 10) ten different digits, 0 to 9, are used to write all the numbers. In the binary number system (base 2) two different digits are used, i.e. 0 and 1.

¡¡¡¡Which one of the following numbers is not a valid number in the

¡¡¡¡octal number system (base 8)?

¡¡¡¡A) 128 B) 127 C) 126 D) 125 E) 124

¡¡¡¡2¡¢The number of diagonals that can be drawn in a regular polygon with

¡¡¡¡twenty sides (icosagon) is_____.

¡¡¡¡3¡¢If a and b are integers, 103=1,1527=3, and then 3796 is equal to_____.

¡¡¡¡4¡¢Two numbers are in the ratio 2 : 3. When 4 is added to each number the ratio changes to 5 : 7.The sum of the two original numbers is____.

¡¡¡¡5¡¢The greatest number of Mondays which can occur in 45 consecutive

¡¡¡¡days is____

¡¡¡¡6¡¢Saul plays a video game in which he scores 4 for a hit and lost 6 for a miss. After 20 rounds his score is 30. The number of times he has missed is____.

¡¡¡¡7¡¢Three girls A, B and C run in a 100 m race. When A finishes, B is 10 m

¡¡¡¡behind A and when B finishes C is 20 m behind B. How far in metres was C from A when A finished?(Lets assume all the athletes run at a constant speed)

¡¡¡¡8¡¢The areas of the faces of a rectangulabox are 84 cm2 , 70 cm2and 30 cm2.The volume of the box in cm3 is____.

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