Page 10 - Arithmetic

Exercise
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Which of the following is always odd?
a) Difference of two odd numbers
c) Product of two odd numbers
e) Product of one even and one odd number
The smallest prime number is:
a)0 c)2 e) 5
b) Sum of two even numbers d) Sum of two odd numbers
b) 1 d) 3
For any integer k, if k5 is odd, which of the following statements is false?
I. k is an odd number
a) I only
c) II only
e) I and II only
II. k is an even number III. k4 is even
b) II and III only d) III only
If ‘a’ and ‘b’ are two negative integers, then which of the following is always true?
I. a + b is positive
a) I only c) II only e) IV only
II. ab is negative
III. a – b is negative
b) III and IV only d) I and II only
IV. ab is positive
What is the total number of prime numbers less than 50?
a) 15 c) 18 e) 14
How many even prime numbers are there? a) 0
c) 2
e) 4
b) 13 d) 17
b) 1 d) 3
Which of the following is the largest three-digit prime number?
a) 973 c) 997 e) 983
Which of the following is a prime number? a) 215
c) 191
e) 253
b) 971 d) 969
b) 507 d) 231
Page 9 of 55
Arithmetic Concept