CK-12 Foundation
Ck 12: Elem Math: Overview of Mixed Operations Numbers to 100
[Free Registration/Login may be required to access all resource tools.] The video uses an example with addition and subtraction to show how to solve a multi-step problem including a description of the actual two-digit addition and...
CK-12 Foundation
Ck 12: Elem Math: Overview of Subtraction Numbers to 100
[Free Registration/Login may be required to access all resource tools.] The video explains two 2-digit subtraction problems one with regrouping and the other without regrouping.
CK-12 Foundation
Ck 12: Elem Math: Overview of Mixed Operations Numbers to 100 Word Problems
[Free Registration/Login may be required to access all resource tools.] The video shows one review problem with mixed operations where students have to add and subtract two-digit numbers.
CK-12 Foundation
Ck 12: Elem Math: Overview of Mixed Operations Numbers to 1000
[Free Registration/Login may be required to access all resource tools.] The video shows one review problem with mixed operations where students have to add and subtract three-digit numbers.
Math Mammoth
Math Mammoth: A Mental Math Trick: Addition With Nine and Eight
Learn a simple trick to help you add 9 or 8 to a number quickly, and how this can work with larger numbers ending in 9 or 8 as well. [8:59]
Math Mammoth
Math Mammoth: Adding Three or Four Single Digit Numbers Mentally
In this lesson, students are shown strategies for adding several single-digit numbers in their heads. [7:12]
Math Mammoth
Math Mammoth: Add a 2 Digit Number and a 1 Digit Number Mentally: No Regrouping
Uses visual representations to model how to solve the addition of a 2-digit and a 1-digit number where there is no regrouping. [9:10]
Math Mammoth
Math Mammoth: Review: Adding and Subtracting Whole Tens
This video goes over how to add and subtract multiples of ten to or from a 2-digit number. [8:14]
Math Mammoth
Math Mammoth: Mental Math: Add and Subtract Multiples of Ten
This video goes over how to add and subtract multiples of ten to or from a 3-digit number. [9:54]
Math Mammoth
Math Mammoth: Add and Subtract Multiples of 100: Mental Math
Learn how to add and subtract multiples of a hundred when working with 3-digit numbers. [8:14]
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]
Khan Academy
Khan Academy: Subtracting 10s Using Place Value
Demonstrates how to subtract 40 from 65 using drawings of base ten cubes to represent 1s and 10s. [2:37]
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: Rounding Numbers Using a Number Line
The concept of rounding numbers is first demonstrated using a number line. Secondly, the rounding rules are defined.
CK-12 Foundation
Ck 12: Elem Math: Overview of Addition Sums to 100
[Free Registration/Login may be required to access all resource tools.] The video explains two, two-digit addition problems one with regrouping and the other without regrouping.
PBS
Pbs: Odd Squad: It's Picture Day!
It's Picture Day at Odd Squad, and Otto needs to use an equation to calculate how long he needs to wait in line.
Khan Academy
Khan Academy: Subtracting 1s or 10s (No Regrouping)
Practice subtracting numbers less than 100 where there is no regrouping.