Add 2 – Digit Numbers

You can use place-value models to add 2-digit numbers.

Estimate. Then find the sum using place value or mental math.

STEP 1: Add the ones.

STEP 2: Regroup as necessary.

STEP 3: Add the tens.

Find out more about adding 2-digit numbers by reading the explanation below.

Practice Time! Finding the sum of two – digit numbers by adding the ones first then the tens in the exercises below.