Mathematics

Grade-4-

Easy

Question

# From the following which number is not a prime number.

- 9
- 11
- 13
- 17

Hint:

### A natural number which has exactly two factors, i.e. 1 and the number itself, is a **prime number**.

## The correct answer is: 9

### Check every option for prime number.

We can see that only option (a) has more than two factors.
Therefore, 9 is not a prime number.
The correct option is (a) 9.

### Related Questions to study

MathematicsVideo

### The L.C.M. of 50 and 60 is___________.

Step 1: Find the prime factors of 50 and 60.

50 = 2 x 5 x 5

60 = 2 x 2 x 3 x 5

Step 2:

LCM = 2 x 5 x 5 x 2 x 3

LCM = 300

The correct option is (b) 300.

### The L.C.M. of 50 and 60 is___________.

MathematicsGrade-4-

Step 1: Find the prime factors of 50 and 60.

50 = 2 x 5 x 5

60 = 2 x 2 x 3 x 5

Step 2:

LCM = 2 x 5 x 5 x 2 x 3

LCM = 300

The correct option is (b) 300.

Mathematics

### Tell the time the clock shows.

### Tell the time the clock shows.

MathematicsGrade-1

Mathematics

### Find the time the clock shows.

### Find the time the clock shows.

MathematicsGrade-1

Mathematics

### Choose the clock which shows the time 9 o’clock.

### Choose the clock which shows the time 9 o’clock.

MathematicsGrade-1

Mathematics

### Which clock shows the time as 11 o’clock?

### Which clock shows the time as 11 o’clock?

MathematicsGrade-1

Mathematics

### Danny starts playing a cricket match one hour after 5 o’clock. What time did he start playing the match?

### Danny starts playing a cricket match one hour after 5 o’clock. What time did he start playing the match?

MathematicsGrade-1

Mathematics

### Simon likes to read after 4o’clock and before 6o’clock which clock shows the time Simon might read?

### Simon likes to read after 4o’clock and before 6o’clock which clock shows the time Simon might read?

MathematicsGrade-1

Mathematics

### The one hour before of 8 o’clock is _____.

### The one hour before of 8 o’clock is _____.

MathematicsGrade-1

Mathematics

### Two hours after 10 o’clock is _____.

### Two hours after 10 o’clock is _____.

MathematicsGrade-1

Mathematics

### John starts playing drums at 10 o’clock. He plays continuously one hour. At what time he finished playing drums.

### John starts playing drums at 10 o’clock. He plays continuously one hour. At what time he finished playing drums.

MathematicsGrade-1

Mathematics

### Lisa rides her bike after 6 o’clock before 8 o’clock. Choose the clock that shows the time Lisa might ride her bike.

### Lisa rides her bike after 6 o’clock before 8 o’clock. Choose the clock that shows the time Lisa might ride her bike.

MathematicsGrade-1

Mathematics

### 1 hour before 1 o’clock is ____.

### 1 hour before 1 o’clock is ____.

MathematicsGrade-1

Mathematics

### 1 hour before 12 o’clock is ____

### 1 hour before 12 o’clock is ____

MathematicsGrade-1

Mathematics

### The music concert starts at 10 o’clock and it ends after one hour. At what time the music concert ends?

### The music concert starts at 10 o’clock and it ends after one hour. At what time the music concert ends?

MathematicsGrade-1

Mathematics

### Bill says the clock shows 3 o’clock. Benny says the clock shows 12 o’clock. Do you agree?

### Bill says the clock shows 3 o’clock. Benny says the clock shows 12 o’clock. Do you agree?

MathematicsGrade-1