Quote:
Originally Posted by mary1997
Find the missing numbers and explain the pattern:
1. 1,3,__, 15, 25, 75
2. 1,2,7, __, 49, 98
3. 1,2,4,5,10,20,25,__,100
4. 1,2,3,4,6,8,12,__,24,48

These are not really patterns as we normally think about them since with patterns we can keep going as long as we keep using the same rule.
These are lists of factors.
1. Factors of 75: 1, 3, 5, 15, 25, 75
2. Factors of 98: 1, 2, 7, 14, 49, 98
3. Factors of 100: 1, 2, 4, 5, 10, 20, 25, 50 , 100
4. Factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48