Scholastic
Study Jams! Properties of Addition
Zoe from the StudyJams! crew brings the properties of addition to life by clearly explaining the meaning of the associative, commutative, and identity properties as she collects photos for an album. Listen to the included karaoke song...
Scholastic
Study Jams! Relate Addition & Subtraction
Understanding the inverse relationship between addition and subtraction is essential for developing fluency in young mathematicians. Zoe and RJ explain how three numbers can form fact families that make two addition and two subtraction...
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: 2 Digit Subtraction
This video shows subtraction of two-digit numbers and place value to tens. [2:54]
Khan Academy
Khan Academy: Subtraction: Introduction to Borrowing or Regrouping
A video covering a review of subtraction using a number line, followed by subtraction of numbers up to three-digits by using borrowing and regrouping.
Khan Academy
Khan Academy: Worked Example: Subtracting 3 Digit Numbers (Regrouping Twice)
Demonstrates how to subtract 3-digit numbers when there is regrouping in the ones and the tens places. The example used is 913 - 286. [3:47]
Math Playground
Math Playground: How Do You Subtract by Regrouping?
This video illustrates how to perform subtraction by regrouping (or borrowing).
Khan Academy
Khan Academy: Intro to Addition and Subtraction: Basic Subtraction
This video lesson provides an introduction to subrtraction.
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: Properties and Patterns for Multiplication
Sal changes the order of numbers or decomposes numbers to simplify multiplication problems.
Khan Academy
Khan Academy: Worked Example: Subtracting 3 Digit Numbers (Regrouping)
Learn to use regrouping (borrowing) and place value to subtract 971-659.
Khan Academy
Khan Academy: Methods for Subtracting 3 Digit Numbers
Subtract 357-156 using place value strategies.
Khan Academy
Khan Academy: Subtracting 3 Digit Numbers (Regrouping)
Sal uses regrouping (borrowing) and place value to subtract 629-172.