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Timed Test For
Greatest common factor
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Sample Problem
**Find the greatest common factor of $7, 15,$ and $21$.** [[☃ math-keypad 1]]
Find the greatest common factor of
7
,
15
,
7, 15,
7
,
1
5
,
and
21
21
2
1
.
Check Answer
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Duration
30 seconds
60 seconds (1 minute)
120 seconds (2 minutes)
180 seconds (3 minutes)
300 seconds (5 minutes)
