Curated Video
Finding the Area of Polygons by Decomposing
In this video, the teacher explains how to find the area of polygons by breaking them down into familiar shapes such as triangles, rectangles, parallelograms, and trapezoids.
Curated Video
Dividing Two-Digit Numbers by Two-Digit Numbers, and Three-Digit Numbers by Two-Digit Numbers with Remainders
Mr. Addit reviews the process for dividing 2-digit numbers by 2-digit numbers and 3-digit numbers by 3-digit numbers with remainders.
Curated Video
Multiplying Three-Digit Numbers by Two-Digit Numbers with Regrouping
Mr. Addit reviews multiplying 2-digits by 2-digits with regrouping. He then demonstrates the method for multiplying 3-digits by 2-digits with regrouping and stresses the importance of being careful about putting numbers in their proper...
Curated Video
Review for You: Multiplying with Regrouping
Mr. Addit reviews multiplication of 2 digits by 1 digit, 3 digits by 1 digit, 2 digits by 2 digits, and 2 digits by 3 digits.
Curated Video
Review for You: Division
Mr. Addit reviews division of 2 digits by 1 digit, 2 digits by 2 digits, and 3 digits by 2 digits. He demonstrates division problems with remainders, and checks his division work by using multiplication.
Curated OER
Singapore Math: Grade 3a, Unit 2 (Part 3)
Using three-digit numbers, this video discusses the process used to add and subtract with regrouping. The instructor also focuses on determining when and when not to regroup. It describes precisely what is happening when a problem...
Khan Academy
Khan Academy: Adding 3 Digit Numbers
Learn to use regrouping, or carrying to add 709+996, 373+88, and 149+293.
Khan Academy
Khan Academy: Subtracting a 1 Digit Number With Regrouping
Demonstrates how to solve 35 - 8 using drawings of base ten cubes to show the regrouping of ones and tens. [3:11]
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]
Khan Academy
Khan Academy: Worked Example: Subtracting 3 Digit Numbers (Regrouping From 0)
Demonstrates how to subtract 3-digit numbers when the first number has a zero in the tens place. The example used is 301 - 164. [2:23]
CK-12 Foundation
Ck 12: Elem Math: Overview of Addition (Sums to 1,000)
[Free Registration/Login may be required to access all resource tools.] Video demonstrating how to add two 3-digit numbers vertically with no regrouping. [1:04]
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]
CK-12 Foundation
Ck 12: Elem Math: Overview of Subtraction Numbers to 1000
[Free Registration/Login may be required to access all resource tools.] The video explains two 3-digit addition problems one with regrouping and the other without regrouping.