Attributes of Numbers
Directions: In each set of numbers, one number does not belong. Circle this number and
explain why it does not belong with the others. Consider reasons such as primes, composites,
factors, and even spelling. Then replace the number that does not belong with a number that
does.
1.
2, 4, 7, 10
2.
3, 5, 7, 9
3.
12, 20, 26, 38
4.
3, 4, 6, 9
5.
2, 6, 12, 20
6.
15, 20, 35, 85
7.
9, 16, 20, 25
8.
313, 1001, 111, 1313
9.
3, 13, 31, 47
10.
28, 30, 31, 32
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