# 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:

Q8:

Ethan is using partial sums to add.

Help him finish his calculation.

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 .

Q11:

Max wants to solve .

He made partial sums by adding the hundreds, then the tens, and then the ones.

Add 500 and 30 and 12 to find the total.

Q12:

Find .