Lesson: Mental Addition of Numbers up to 1000 Math in Focus • Singapore Math • Grade 2 • Volume B • Common Core • enVisionmath2.0 • Grade 2 • Volume 2 • Common Core • enVisionmath2.0 • Grade 4 • Volume 1 • Common Core • enVisionmath 2.0 • Grade 3 • Volume 2 • Common Core

Mathematics

In this lesson, we will learn how to add two- and three-digit numbers using mental strategies rather than the column method.

Sample Question Videos

Q1:

Ethan thinks of two different numbers: 437 and 442. What is the total of these numbers?

Q2:

Calculate .

Q3:

Complete the diagram below by following the arrows.

Preview