Factors and multiples

Observe the following.

1×__=30, 2×__=30, 3×__=30, 5×__=30. What is the sum of all the missing factors of 30?

• 60

• 30

• 45

• 61

What is the product of the common factors of 10 and 15?

• 6

• 5

• 150

• 25

• 6=2×2

• 12=2×6

• 24= 2×12

• 48=2×24

What is the difference between the fifth multiple of 7 and the seventh multiple of 5?

What is the product of the first four multiples of 4?

Which is the greatest among the following?

• The third multiple of 9.

• The fifth multiple of 4.

• The seventh multiple of 3.

• The fourth multiple of 6.

The smallest non-zero multiple of a number is___.

• 0

• 1

• The number itself

• 2

Which of the following is the first common multiple of 3 and 4?

• 15

• 20

• 21

• 12

Find the sum of second common multiple and first common multiple of 4 and 5.

• 60

• 40

• 0

• 20

Which of the following is the smallest prime number greater than 50?

• 53

• 50

• 47

• 57