# Worksheet: Column Addition of Three-Digit Numbers: Partial Sums

In this worksheet, we will practice use place-value blocks and tables to add three-digit numbers by adding the hundreds, tens, and ones separately before finding the sum of these partial sums.

**Q1: **

Find the result of .

*Hint*: Make partial sums of ones, tens, and hundreds, then add the partial sums.

**Q2: **

Use partial sums to find .

**Q3: **

Find the sum.

*Hint*: Add the hundreds, then the tens, then the ones, then find the total.

**Q4: **

Finish finding partial sums to solve .

**Q5: **

Find the sum.

*Hint*: Start by adding the hundreds, tens, and ones separately.

**Q6: **

We can write numbers in expanded form to help us add.

Write 562 in expanded form.

- A
- B
- C
- D

Write 348 in expended form.

- A
- B
- C
- D

Find using partial sums.

*Hint*: Add the hundreds, then the tens, then the ones, and then find the total.

**Q7: **

Find the answer to .

*Hint*: Find partial sums to help you.

**Q8: **

Ethan is using partial sums to add.

Help him finish his calculation.

Add the ones.

Add the partial sums to find .

**Q9: **

Look at how Amelia solved by finding partial sums.

Use Amelia’s method to solve this problem.

**Q10: **

Find the sum of .

**Q12: **

Find .

*Hint*: Make partial sums by adding the hundreds, adding the tens, and adding the ones.

**Q13: **

Find .

*Hint*: Make partial sums.