Build a 3-Digit Number from Parts

In this activity, students practice composing numbers by combining hundreds, tens, and ones to build a 3-digit number. For example: 200 + 70 + 3 = ? → the answer is 273.

This skill reinforces place value understanding and directly supports Common Core Standard 2.NBT.A.1. It’s also a key step toward mental math and addition with regrouping.