Which One Doesn’t
Belong?
Unique Math Challenge!
Created by
Bethany @
MathGeekMama.com
56 82
51 254
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Which One Doesn’t Belong?
Decide which of the following numbers does not belong in the
set. Be able to explain your reasoning.
27 423
54
61
© 2016 MathGeekMama.com
Which One Doesn’t Belong?
Decide which of the following numbers does not belong in the
set. Be able to explain your reasoning.
56
82
51
254
© 2016 MathGeekMama.com
Which One Doesn’t Belong?
Decide which of the following numbers does not belong in the
set. Be able to explain your reasoning.
263 73
505 712
© 2016 MathGeekMama.com
Which One Doesn’t Belong?
Decide which of the following numbers does not belong in the
set. Be able to explain your reasoning.
261 232
34 460
© 2016 MathGeekMama.com
Which One Doesn’t Belong?
Decide which of the following numbers does not belong in the
set. Be able to explain your reasoning.
604 402
501
60
© 2016 MathGeekMama.com
Which One Doesn’t Belong?
Decide which of the following numbers does not belong in the
set. Be able to explain your reasoning.
419
416
317 623
© 2016 MathGeekMama.com
Which One Doesn’t Belong?
Decide which of the following numbers does not belong in the
set. Be able to explain your reasoning.
7
28
21
25
© 2016 MathGeekMama.com
Which One Doesn’t Belong?
Decide which of the following numbers does not belong in the
set. Be able to explain your reasoning.
50
35
42
100
© 2016 MathGeekMama.com
Which One Doesn’t Belong?
Decide which of the following numbers does not belong in the
set. Be able to explain your reasoning.
108 603
502 360
© 2016 MathGeekMama.com
Which One Doesn’t Belong?
Decide which of the following numbers does not belong in the
set. Be able to explain your reasoning.
415 522
225 635
© 2016 MathGeekMama.com
Which one doesn’t belong?
Which one doesn’t belong?
Decide which of the following numbers does not
belong in the group. Explain your reasoning
below.
Decide which of the following numbers does not
belong in the group. Explain your reasoning
below.
27 423
56 82
54 61
51 254
_________ does not belong because:
_________ does not belong because:
__________________________________________
__________________________________________
Now give another possible answer, using different reasoning.
Now give another possible answer, using different reasoning.
_________ does not belong because:
_________ does not belong because:
__________________________________________
__________________________________________
© 2016 MathGeekMama.com
© 2016 MathGeekMama.com
Which one doesn’t belong?
Which one doesn’t belong?
Decide which of the following numbers does not
belong in the group. Explain your reasoning
below.
Decide which of the following numbers does not
belong in the group. Explain your reasoning
below.
263 73
261 232
505 712
34 460
_________ does not belong because:
_________ does not belong because:
__________________________________________
__________________________________________
Now give another possible answer, using different reasoning.
Now give another possible answer, using different reasoning.
_________ does not belong because:
_________ does not belong because:
__________________________________________
__________________________________________
© 2016 MathGeekMama.com
© 2016 MathGeekMama.com
Which one doesn’t belong?
Which one doesn’t belong?
Decide which of the following numbers does not
belong in the group. Explain your reasoning
below.
Decide which of the following numbers does not
belong in the group. Explain your reasoning
below.
604 403
419 416
501 60
317 623
_________ does not belong because:
_________ does not belong because:
__________________________________________
__________________________________________
Now give another possible answer, using different reasoning.
Now give another possible answer, using different reasoning.
_________ does not belong because:
_________ does not belong because:
__________________________________________
__________________________________________
© 2016 MathGeekMama.com
© 2016 MathGeekMama.com
Which one doesn’t belong?
Which one doesn’t belong?
Decide which of the following numbers does not
belong in the group. Explain your reasoning
below.
Decide which of the following numbers does not
belong in the group. Explain your reasoning
below.
7 28
50 35
21 25
42 100
_________ does not belong because:
_________ does not belong because:
__________________________________________
__________________________________________
Now give another possible answer, using different reasoning.
Now give another possible answer, using different reasoning.
_________ does not belong because:
_________ does not belong because:
__________________________________________
__________________________________________
© 2016 MathGeekMama.com
© 2016 MathGeekMama.com
Which one doesn’t belong?
Which one doesn’t belong?
Decide which of the following numbers does not
belong in the group. Explain your reasoning
below.
Decide which of the following numbers does not
belong in the group. Explain your reasoning
below.
108 603
415 522
502 360
225 635
_________ does not belong because:
_________ does not belong because:
__________________________________________
__________________________________________
Now give another possible answer, using different reasoning.
Now give another possible answer, using different reasoning.
_________ does not belong because:
_________ does not belong because:
__________________________________________
__________________________________________
© 2016 MathGeekMama.com
© 2016 MathGeekMama.com
Which One Doesn’t Belong?
Possible Solutions
27
423
56
82
263
73
261
232
54
61
51
254
505
712
34
460
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
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
© 2016 MathGeekMama.com
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
Which One Doesn’t Belong?
Possible Solutions
604 402
419
416
7
28
50
35
501
317
623
21
25
42
100
60
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
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
© 2016 MathGeekMama.com
35 because it’s
odd
100 because it’s 3
digits
42 because it’s not
a multiple of 5
Which One Doesn’t Belong?
Possible Solutions
108
603
415
522
502 360
225 635
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
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
© 2016 MathGeekMama.com
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