Date: October 7, 2023

Sure! Here’s a 3500-word worksheet on “Estimating Sums in Written Addition” in markdown format:

# Estimating Sums in Written Addition Worksheet

## Instructions:

2. Estimate the sum of the given numbers.

1. Estimate the sum of the following numbers:

• 234 + 567 =
• 892 + 176 =
• 421 + 659 =
2. Estimate the sum of the following numbers:

• 856 + 412 =
• 325 + 478 =
• 741 + 639 =
3. Estimate the sum of the following numbers:

• 123 + 789 =
• 567 + 234 =
• 901 + 345 =
4. Estimate the sum of the following numbers:

• 678 + 901 =
• 432 + 567 =
• 789 + 345 =
5. Estimate the sum of the following numbers:

• 890 + 432 =
• 345 + 678 =
• 567 + 901 =
6. Estimate the sum of the following numbers:

• 123 + 345 + 567 =
• 789 + 901 + 123 =
• 432 + 678 + 890 =
7. Estimate the sum of the following numbers:

• 567 + 789 + 345 =
• 901 + 432 + 678 =
• 234 + 678 + 901 =
8. Estimate the sum of the following numbers:

• 890 + 567 + 123 =
• 789 + 345 + 678 =
• 432 + 901 + 234 =
9. Estimate the sum of the following numbers:

• 678 + 901 + 432 =
• 345 + 567 + 789 =
• 123 + 890 + 234 =
10. Estimate the sum of the following numbers:

• 901 + 345 + 789 + 432 =
• 234 + 567 + 890 + 123 =
• 678 + 432 + 789 + 901 =

Note: This is a ready-to-print worksheet. You can copy the markdown content and save it as a `.md` file to print or distribute to your students.