Front End Estimation math worksheet with addition problems and estimation examples.

Problem Description:

The task involves using front-end estimation to estimate the sums of given pairs of numbers. Front-end estimation is a method where you focus on the leftmost digits (or the "front end") of the numbers and ignore the rest, then adjust slightly if necessary.

Steps to Solve:

1. Identify the front-end digits: These are the leftmost digits or the most significant digits in each number.
2. Estimate by adding the front-end digits: Add these digits together, ignoring the remaining digits for now.
3. Adjust if necessary: Sometimes, you may need to adjust the estimate based on the remaining digits, but in basic front-end estimation, this step is often skipped for simplicity.

Solution:

#### Row 1:
- 456 + 347:
- Front-end digits: 400 + 300 = 700
- Estimate: 700

- 761 + 217:
- Front-end digits: 700 + 200 = 900
- Estimate: 900

- 862 + 863:
- Front-end digits: 800 + 800 = 1600
- Estimate: 1600

#### Row 2:
- 362 + 104:
- Front-end digits: 300 + 100 = 400
- Estimate: 400

- 789 + 297:
- Front-end digits: 700 + 200 = 900
- Estimate: 900

- 425 + 201:
- Front-end digits: 400 + 200 = 600
- Estimate: 600

#### Row 3:
- 961 + 415:
- Front-end digits: 900 + 400 = 1300
- Estimate: 1300

- 346 + 298:
- Front-end digits: 300 + 200 = 500
- Estimate: 500

- 256 + 229:
- Front-end digits: 200 + 200 = 400
- Estimate: 400

#### Row 4:
- 873 + 332:
- Front-end digits: 800 + 300 = 1100
- Estimate: 1100

- 708 + 261:
- Front-end digits: 700 + 200 = 900
- Estimate: 900

- 167 + 425:
- Front-end digits: 100 + 400 = 500
- Estimate: 500

#### Row 5:
- 199 + 317:
- Front-end digits: 100 + 300 = 400
- Estimate: 400

- 223 + 198:
- Front-end digits: 200 + 100 = 300
- Estimate: 300

- 734 + 432:
- Front-end digits: 700 + 400 = 1100
- Estimate: 1100

Final Answer:

\[
\boxed{
\begin{array}{ccc}
700 & 900 & 1600 \\
400 & 900 & 600 \\
1300 & 500 & 400 \\
1100 & 900 & 500 \\
400 & 300 & 1100 \\
\end{array}
}
\]