Grade 2 • Operations

Add Two-Digit Numbers with Place-Value Strategies

Add the tens first. Then add the ones to find the sum.

Interaction Studio

I can add two-digit numbers by adding tens, then ones, and explain how the number changes at each step.

Grade 2 Interaction Studio

Add two-digit numbers with place-value strategies

I can add two-digit numbers by adding tens, then ones, and explain how the number changes at each step.

Try the controlsChange one value and watch the mathematical model respond.

First number278changes the first number used by the visible operation and accessible summarySecond number145changes the second number used by the visible operation and accessible summary

Base-Ten BlocksThe picture, geometry, and labels use the same values as the controls.

Guided steps

Step 1 of 3

Decompose the numbers into place values before choosing an operation strategy.

Studio challenge

Use place value to add 38 + 45.

Use the model and enter your response in the lesson answer field. The studio does not reveal the answer.

Your Turn

Answer each question using the fields below.

Progress: 0 of 20 solved

Question 1 of 20

Use tens and ones to add 38 + 45. What is the sum?

Type your answer