College of William and Mary
Decimal Operations Using Base 10 Blocks
Let's get this block party started and learn about decimals! Here are four main lessons that teach the operations with decimals while using base 10 blocks to provide a hands-on learning approach. Supplemental worksheets and other...
Curated OER
Olympic Games - Can You Measure Up?
Students complete 6 units to learn about Ancient Greece and the Olympic games through physical education activities as well as math activities. In this Ancient Greece lesson, students complete multiple activities in 6 lessons including...
Scholastic
Scholastic: Study Jams! Math: Addition and Subtraction: Additon With Regrouping
Solve problems step by step by addition with regrouping.
Lawrence Hall of Science
The Math Page: Skill in Arithmetic: Add Whole Numbers, Add Decimals
This website explains and defines adding whole numbers and decimals. Content explores addition with regrouping and how to align numbers in a written calculation. There are even practice problems at the end of the lesson.
Khan Academy
Khan Academy: Add and Subtract Mixed Numbers 2 (With Regrouping)
Practice adding and subtracting mixed numbers with common (like) denominators. Some items require regrouping. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
CK-12 Foundation
Ck 12: Elem Math: Addition: 3 Digits
[Free Registration/Login may be required to access all resource tools.] A video and practice questions on adding 3-digit numbers with regrouping. [1:32]
CK-12 Foundation
Ck 12: Elem Math: Adding Two Digit Numbers With Regrouping
[Free Registration/Login may be required to access all resource tools.] The video models how to add two-digit numbers using regrouping. The video is followed by practice problems.
CK-12 Foundation
Ck 12: Elem Math: Overview of Addition Sums to 100 Word Problems
[Free Registration/Login may be required to access all resource tools.] The video explains two addition problems one with regrouping and the other without regrouping.
Scholastic
Scholastic: Study Jams! Math: Addition and Subtraction: Without Regrouping
Solve word problems with addition and subtraction without regrouping. Then test your knowledge.
CK-12 Foundation
Ck 12: Elem Math: Overview of Addition Sums to 100 Word Problems
[Free Registration/Login may be required to access all resource tools.] The video explains two addition problems one with regrouping and the other without regrouping.
Khan Academy
Khan Academy: Subtracting Two Digit Numbers (No Regrouping)
In this exercise, students practice subtracting two-digit numbers (no regrouping). Students receive immediate feedback and have the opportunity to watch a tutorial video, get hints, and try questions repeatedly.
Cool Math
Coolmath: Coolmath4kids: Adding Numbers Within 1000
Step-by-step tutorial showing how to add 3-digit numbers in place value columns with and without regrouping. CCSS.Math.Content.3.NBT.A.2 Fluently add and subtract within 1000
Lawrence Hall of Science
The Math Page: Skill in Arithmetic: The Meaning of Subtraction, and Mental Calculation
This website explains and defines basic subtraction. There are practice problems at the very end of this lesson.
Khan Academy
Khan Academy: Subtraction Within 1000
In this exercise, students practice subtraction within 1000. Students receive immediate feedback and have the opportunity to get hints, watch video tutorials, and try questions repeatedly. CCSS.Math.Content.3.NBT.A.2 Fluently add and...