Sarah created a pattern. Her rule was add 4. All the numbers in Sarah‘s pattern were odd. 3 of the numbers in Sarah‘s pattern were less than 10. What was the starting number for Sarah‘s pattern?

The starting number for Sarah's pattern was 1.

The numbers in Sarah's pattern would be: 1, 5, 9, 13, 17, 21, ...

Three numbers in this pattern (1, 5, 9) are less than 10, and all numbers are odd, following the rule of adding 4 to the previous number.