Number odd one out

Four of these numbers belong together. Which is the odd one out? 74 36 49 81 64

Show the working

The answer is A. Look for something four of them share. Here it is that they are all square numbers: 36, 49, 64, 81. 74 is not, so it is the odd one out. Put the four in order in your head — the pattern is often easier to see that way.

Four of these numbers belong together. Which is the odd one out? 90 61 63 15 9

Show the working

The answer is B. Look for something four of them share. Here it is that they are all multiples of 3: 9, 15, 63, 90. 61 is not, so it is the odd one out. Try the times tables first: four numbers sharing a multiple is the most common version of this.

Four of these numbers belong together. Which is the odd one out? 56 64 72 84 40

Show the working

The answer is D. Look for something four of them share. Here it is that they are all multiples of 8: 40, 56, 64, 72. 84 is not, so it is the odd one out. If the times tables do not work, look for square numbers, or for odd and even.

Four of these numbers belong together. Which is the odd one out? 77 25 49 64 16

Show the working

The answer is A. Look for something four of them share. Here it is that they are all square numbers: 16, 25, 49, 64. 77 is not, so it is the odd one out. Check your rule against all four before deciding which one breaks it.

Four of these numbers belong together. Which is the odd one out? 16 64 49 35 81

Show the working

The answer is D. Look for something four of them share. Here it is that they are all square numbers: 16, 49, 64, 81. 35 is not, so it is the odd one out. Try the times tables first: four numbers sharing a multiple is the most common version of this.

Four of these numbers belong together. Which is the odd one out? 25 60 81 64 49

Show the working

The answer is B. Look for something four of them share. Here it is that they are all square numbers: 25, 49, 64, 81. 60 is not, so it is the odd one out. Check your rule against all four before deciding which one breaks it.

Four of these numbers belong together. Which is the odd one out? 25 36 35 64 16

Show the working

The answer is C. Look for something four of them share. Here it is that they are all square numbers: 16, 25, 36, 64. 35 is not, so it is the odd one out. If the times tables do not work, look for square numbers, or for odd and even.

Four of these numbers belong together. Which is the odd one out? 81 29 49 64 25

Show the working

The answer is B. Look for something four of them share. Here it is that they are all square numbers: 25, 49, 64, 81. 29 is not, so it is the odd one out. If the times tables do not work, look for square numbers, or for odd and even.

Four of these numbers belong together. Which is the odd one out? 81 49 43 16 64

Show the working

The answer is C. Look for something four of them share. Here it is that they are all square numbers: 16, 49, 64, 81. 43 is not, so it is the odd one out. Try the times tables first: four numbers sharing a multiple is the most common version of this.

Four of these numbers belong together. Which is the odd one out? 63 54 72 81 80

Show the working

The answer is E. Look for something four of them share. Here it is that they are all multiples of 9: 54, 63, 72, 81. 80 is not, so it is the odd one out. Put the four in order in your head — the pattern is often easier to see that way.

Four of these numbers belong together. Which is the odd one out? 36 81 25 49 34

Show the working

The answer is E. Look for something four of them share. Here it is that they are all square numbers: 25, 36, 49, 81. 34 is not, so it is the odd one out. Check your rule against all four before deciding which one breaks it.

Four of these numbers belong together. Which is the odd one out? 49 25 54 81 64

Show the working

The answer is C. Look for something four of them share. Here it is that they are all square numbers: 25, 49, 64, 81. 54 is not, so it is the odd one out. Try the times tables first: four numbers sharing a multiple is the most common version of this.

Well done, you finished!

Try another set Pick a different topic

The working

The working

The working

The working

The working

The working

The working

The working

The working

The working

The working

The working

Well done, you finished!

Number odd one out

Question 1 of 12

The working

Question 2 of 12

The working

Question 3 of 12

The working

Question 4 of 12

The working

Question 5 of 12

The working

Question 6 of 12

The working

Question 7 of 12

The working

Question 8 of 12

The working

Question 9 of 12

The working

Question 10 of 12

The working

Question 11 of 12

The working

Question 12 of 12

The working

Well done, you finished!