Worksheet: Adding Ones to Three-Digit Numbers

In this worksheet, we will practice modeling adding a one-digit number to a three-digit number and investigate which digits in the number change.

Q1:

Olivia has broken apart a number to help her add.

Add the ones.

3 + 5 = .

Add the ones to 410 to find the total.

4 1 3 + 5 = .

Q2:

Find the total by first adding the ones.

Q3:

Find the total by first adding the ones.

Q4:

Look at how Anthony broke apart a number to add.

Add the ones.

4 + 3 = .

Add to find the total.

Q5:

Count on in ones to find the sum.

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