Art of Problem Solving
Associative Property of Addition
Groupings are the way to go! The short video provides a description of the associative property of addition and gives an example. Learners view how to write the property using variables.
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Addition 2
This video covers addition by counting and using a number line, followed by place value concepts and addition of two-digit numbers. Practice problems are available. [12:26]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Place Value 1
This video teaches place value to the thousands. Practice problems are available. [2:25]
Khan Academy
Khan Academy: Understand Place Value When Adding Ten
Demonstrates how to add two 2-digit numbers, with no regrouping, using drawings of base ten cubes to represent 1s and 10s. [3:16]
Virtual Nerd
Virtual Nerd: What Is Place Value for Whole Numbers?
Place value helps keep numbers straight. This tutorial displays a place value chart and provides a better understanding of place value. [8:12]
Math Mammoth
Math Mammoth: Mental Addition of Two Digit Numbers
This video explains some strategies that are helpful for adding two-digit numbers in your head. [8:00]
Math Mammoth
Math Mammoth: Mental Addition: Add 2 Digit and 1 Digit Number (With Regrouping)
Teaches mental math strategies for adding a two-digit and a one-digit number. [7:41]
Mucho Math
Algebra2go: Digits and Place Value: Part 2
This video will use expanded forms of numbers to help students understand place value. Additionally students will learn how to write numbers as word statements.
Khan Academy
Khan Academy: Strategies for Adding 2 Digit Numbers
Sal goes through multiple strategies for adding 2-digit numbers. [3:15]
Khan Academy
Khan Academy: Strategies for Adding 2 Digit Numbers
Watch as Sal goes through multiple strategies for adding 2-digit numbers. [3:15]