Whole Numbers

34. The product of successor and predecessor of 999 is

• (A) 999000
• (B) 998000
• (C) 989000
• (D) 1998

33. By which of the following number, we cannot divide a whole number?

• (A) 2
• (B) –1
• (C) 1
• (D) 0

32. Which of the following is not defined?

• (A) 5 + 0
• (B) 5 – 0
• (C) 5 × 0
• (D) 5 ÷ 0

31. Which of the following statements is not true?

• (A) 0 + 0 = 0
• (B) 0 – 0 = 0
• (C) 0 × 0 = 0
• (D) 0 ÷ 0 = 0

30. The product of a non-zero whole number and its successor is always divisible by

• (A) 2
• (B) 3
• (C) 4
• (D) 5

29. The product of a non-zero whole number and its successor is always

• (A) an even number
• (B) an odd number
• (C) a prime number
• (D) divisible by 3

28. A whole number is added to 25 and the same number is subtracted from 25. The sum of the resulting numbers is

• (A) 0
• (B) 25
• (C) 50
• (D) 75

27. Which of the following is not true?

• (A) (7 + 8) + 9 = 7 + (8 + 9)
• (B) (7 × 8) × 9 = 7 × (8 × 9)
• (C) 7 + 8 × 9 = (7 + 8) × (7 + 9)
• (D) 7 × (8 + 9) = (7 × 8) + (7 × 9)

26. By using dot (.) patterns, which of the following numbers can be arranged in all the three ways namely a line, a triangle and a rectangle?

• (A) 9
• (B) 10
• (C) 11
• (D) 12

25. Number of primes between 1 and 100 is

• (A) 2
• (B) 3
• (C) 4
• (D) 5

24. Sum of the number of primes between 16 to 80 and 90 to 100 is

• (A) 20
• (B) 18
• (C) 17
• (D) 16

23. If A is a ten-digit number and B is a nine-digit number, then which among the following is true?

• (A) A = B
• (B) A > B
• (C) A < B
• (D) None of these

22. Which of the following is not true?

• (A) Natural numbers are closed under addition
• (B) Natural numbers are closed under subtraction
• (C) Natural numbers are closed under multiplication
• (D) None of these

21. Which of the following statements is not true?

• (A) Both addition and multiplication are associative for whole numbers.
• (B) Zero is the identity for multiplication of whole numbers.
• (C) Addition and multiplication both are commutative for whole numbers.
• (D) Multiplication is distributive over addition for whole numbers.

20. Which of the following is not true?

• (A) Addition is commutative for natural numbers
• (B) Multiplication is commutative for natural numbers
• (C) 1 is the identity for addition of whole numbers
• (D) 0 is the identity for addition of whole numbers

19. There is a whole number which when added to a whole number, gives the number itself. The number is

• (A) –1
• (B) 1
• (C) 0
• (D) 2

18. The smallest 6 digit natural number ending in 5 is

• (A) 10050
• (B) 10235
• (C) 10005
• (D) 10105