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 399+426.

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

Q2:

Use partial sums to find 825+165.

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 721+193.

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.

  • A500+60+2
  • B5+60+200
  • C50+600+2
  • D5+6+2

Write 348 in expended form.

  • A300+40+8
  • B3+4+8
  • C30+400+8
  • D3+40+800

Find 562+348 using partial sums.

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

Q7:

Find the answer to 168+254.

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 509+325.

Q9:

Look at how Amelia solved 478+231 by finding partial sums.

Use Amelia’s method to solve this problem.

Q10:

Find the sum of 253+125.

Q11:

Max wants to solve 215+327.

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 427+338.

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

Q13:

Find 263+219.

Hint: Make partial sums.

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