1)Which of the following is a prime number?
A) 16 B) 17 C) 18 D) 21
2)Which one of the following numbers is composite?
A) 31 B) 41 C) 61 D) 91
3)Which one of the following numbers is composite?
A) 101 B) 103 C) 105 D) 107
4)The number 24 is to be written as a product of its prime factors. Which one of the following is correct?
A)3 × 8 B) 4 × 6 C) 2 × 3 × 4 D) 2 × 2 × 2 × 3
5)The number 90 is to be written as a product of its prime factors. Which one of the following is correct?
A) 2 × 5 × 9 B) 2 × 3 × 3× 5 C) 3 × 5 × 6 D) 2 × 3 × 15
6)The number 40 is to be written as a product of its prime factors.
Which one of the following is correct?
A) 16 B) 17 C) 18 D) 21
2)Which one of the following numbers is composite?
A) 31 B) 41 C) 61 D) 91
3)Which one of the following numbers is composite?
A) 101 B) 103 C) 105 D) 107
4)The number 24 is to be written as a product of its prime factors. Which one of the following is correct?
A)3 × 8 B) 4 × 6 C) 2 × 3 × 4 D) 2 × 2 × 2 × 3
5)The number 90 is to be written as a product of its prime factors. Which one of the following is correct?
A) 2 × 5 × 9 B) 2 × 3 × 3× 5 C) 3 × 5 × 6 D) 2 × 3 × 15
6)The number 40 is to be written as a product of its prime factors.
Which one of the following is correct?
A) 2 × 3 × 5 B) 22 × 52 C) 22 × 10 D) 22 × 5
7)The number 540 is to be written as a product of its prime factors.
Which expression is correct?
Which expression is correct?
A) 22 × 32× 15 B) 23 × 32× 5 C) 22 × 33× 5 D) 24 × 33
8)How many different prime factors does the number 252 have?
A)2 B) 3 C) 5 D) 7
9)How many different prime factors does the number 3,150 have?
A) 2 B) 4 C)6 D) 8
10)Which of the following is a prime number?
A) 51 B) 71 C) 81 D) 91
11) What is the least odd composite number?
12) What is the least even composite number?
13) The number of even prime numbers is __________
14) The number of prime numbers between 50 and 100 is _________
15) The unit digit of product of all odd prime numbers is ___________
16) The unit digit of Product of all prime numbers is ____________
17) How many million make s one billion?
18) Product of 10 consecutive odd numbers is (even/odd)
19) sum of 25 odd numbers is (even/odd)
20) sum of even number of odd numbers and odd number of even numbers is (even/odd).
11) What is the least odd composite number?
12) What is the least even composite number?
13) The number of even prime numbers is __________
14) The number of prime numbers between 50 and 100 is _________
15) The unit digit of product of all odd prime numbers is ___________
16) The unit digit of Product of all prime numbers is ____________
17) How many million make s one billion?
18) Product of 10 consecutive odd numbers is (even/odd)
19) sum of 25 odd numbers is (even/odd)
20) sum of even number of odd numbers and odd number of even numbers is (even/odd).