which one doesn’t belong? - math geek mama · which one doesn’t belong? decide which of the...

Which One Doesn’t Belong?

Unique Math Challenge!

Created by Bethany @

MathGeekMama.com

56 82

51 254

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Decide which of the following numbers does not belong in the set. Be able to explain your reasoning.

© 2016 MathGeekMama.com

27 423

54 61




56 82

51 254




263 73

505 712




261 232

34 460




604 402

501 60




419 416

317 623




7 28

21 25




50 35

42 100




108 603

502 360




415 522

225 635

Which one doesn’t belong?

Decide which of the following numbers does not belong in the group. Explain your reasoning

below.

_________ does not belong because:

__________________________________________

Now give another possible answer, using different reasoning.


__________________________________________




below.


__________________________________________



__________________________________________


27 423

54 61

56 82

51 254



below.


__________________________________________



__________________________________________




below.


__________________________________________



__________________________________________


263 73

505 712

261 232

34 460



below.


__________________________________________



__________________________________________




below.


__________________________________________



__________________________________________


604 403

501 60

419 416

317 623



below.


__________________________________________



__________________________________________




below.


__________________________________________



__________________________________________


7 28

21 25

50 35

42 100



below.


__________________________________________



__________________________________________




below.


__________________________________________



__________________________________________


108 603

502 360

415 522

225 635

Which One Doesn’t Belong? Possible Solutions

54 because it’s even 423 because it’s 3 digits 61 because the sum doesn’t equal 9 61 because it’s not a multiple of 9 27 because all the digits are prime

27 423

54 61

56 82

51 254

263 73

505 712

261 232

34 460

51 because it’s odd 254 because it’s 3 digits 82 because it doesn’t have a 5 in the tens place

73 because it’s 2 digits 712 because it’s even 263 because the sum doesn’t equal 10 263 because one of the digits isn’t prime

34 because it’s only 2 digits 261 because it’s odd 460 because the product of all digits isn’t 12 232 because all the digits are prime



60 because it’s only 2 digits 501 because it’s odd 60 because it doesn’t have 0 in the tens place 604 because the sum of the digits doesn’t equal 6

604 402

501 60

419 416

317 623

7 28

21 25

50 35

42 100

416 because it’s even 419 because the sum of the digits doesn’t equal 11 623 because it doesn’t have a 1 in the tens place 317 because all the digits are prime

7 because it’s only one digit 28 because it’s even 25 because it’s not a multiple of 7 28 because one digit isn’t prime

35 because it’s odd 100 because it’s 3 digits 42 because it’s not a multiple of 5



603 because it’s odd 360 because it doesn’t have a 0 in the tens place 502 because the sum of the digits doesn’t equal 9

108 603

502 360

415 522

225 635

522 because it’s even 635 because the product of the digits doesn’t equal 20 522 because it’s not a multiple of 5


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