First, look for a pattern. Notice how each number is 3 times the previous number:

3, 9, __, 81, 243, 729

Multiply 9 by 3 to find the missing number:

9 × 3 = 27

To make the pattern complete, the number 27 must go in the blank space.

First, look for a pattern. Notice how each number is 10 times the previous number:

1, 10, 100, __, 10,000, 100,000

Multiply 100 by 10 to find the missing number:

100 × 10 = 1,000

To make the pattern complete, the number 1,000 must go in the blank space.

First, look for a pattern. Notice how each number is 10 times the previous number:

1, 10, 100, 1,000, 10,000, __

Multiply 10,000 by 10 to find the missing number:

10,000 × 10 = 100,000

To make the pattern complete, the number 100,000 must go in the blank space.