It seems like you're looking for the missing number in a sequence: 10, 19, ?, 199.

To solve this, let's analyze the differences between the known numbers:

1. **19 - 10 = 9**  
   The difference between the first two numbers is 9.

2. **199 - 19 = 180**  
   The difference between the second number and the fourth number is 180.

We need to figure out the third number by identifying a pattern. One common pattern involves a multiplicative increase in the differences:

- If the difference increases by a multiple of 20, then:
  - The next difference (from 19 to ?) could be \( 9 \times 20 = 180 \).

So, adding 180 to 19:

\[
19 + 180 = 199
\]

It turns out that this directly connects 19 to 199, so perhaps there is no middle term. Alternatively, other patterns could involve geometric or non-linear progressions.

Let me know if you'd like more details or additional analysis of this pattern.

---

Here are five related questions:
1. Can you find the missing number in the sequence 5, 12, ?, 68?
2. What is the next number in the sequence 3, 9, 27, 81, ...?
3. Solve for the missing number: 7, 14, ?, 56.
4. Can you determine the pattern in 100, 80, 60, ?, 20?
5. What would be the 5th term of the sequence 1, 1, 2, 3, 5, ...?

**Tip:** Always check for both additive and multiplicative patterns when solving sequences.

Explore how to find the missing number in the sequence 10, 19, ?, 199 by analyzing differences between terms. This problem focuses on arithmetic sequences and patterns, suitable for students in Grades 5-7. Learn step-by-step solutions and related questions.

Math Problem Statement

Solution

Ask a new question for Free

By Image

Math Problem Analysis

Mathematical Concepts

Formulas

Theorems

Suitable Grade Level

Related Recommendation