CK-12 Foundation
Ck 12: Elem Math: Overview of Addition
[Free Registration/Login may be required to access all resource tools.] The video describes the two basic methods of adding numbers up to twenty. The methods shown are counting on and using tens and ones.
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: The "Teen" Numbers: Thirteen Through Nineteen: Place Value Lesson
In this lesson, students learn that the number suffix 'teen' actually means 'ten' and how this relates to place value. Includes some work with a hundreds chart. [7:15]
Math Mammoth
Math Mammoth: Sums With 6: Addition Facts Lesson
This lesson goes over the addition facts for 6 and has students practice along in their heads for a drill. [5:16]
Math Mammoth
Math Mammoth: Sums With 9: Addition Facts Lesson
A lesson on the addition facts where the sum is 9. Includes some drills, a word problem, and problems comparing a sum to a number. [5:36]
Khan Academy
Khan Academy: Adding 8+7
Demonstrates how to count pieces of fruit and make a group of ten to find the sum of 8 + 7. [3:18]
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: Teens as Sums With 10
The video looks at the 1 in each teen number and thinks about what it really means as representing 10, and the pattern of the teen numbers as ten plus some other number.
Math Mammoth
Math Mammoth: Naming and Writing Two Digit Numbers
In this lesson, students learn how to assign place value to two-digit numbers, how to write numbers as groups of tens and ones, and how to match place value to sets of dots. [5:13]
Math Mammoth
Math Mammoth: Sums With 7 Basic Addition Lesson
Teaches strategies for learning the addition facts for seven. Students are then presented with an addition facts drill where they practice along to the video. This is followed by addition problems, a word problem, and an arithmetic...
Math Mammoth
Math Mammoth: Sums With 8 Addition Lesson
Teaches strategies for learning the addition facts for eight. Students are then presented with an addition facts drill where they practice along to the video. This is followed by missing number and number line problems. [5:06]
Math Mammoth
Math Mammoth: Add and Subtract Whole Tens
Teaches how to add and subtract multiples of ten. [5:07]
PBS
Pbs: Odd Squad: Welcome to the Break Room, Part 1
Learn about place value with the Odd Squad. Agent Oscar shows us around the Odd Squad break room, where agents hang out while they're not working on cases. A gadget can multiply any amount of food by ten!
PBS
Pbs: Odd Squad: Combining Gadgets
Use this fun example to compose 10 from numbers within 10. Agent Oscar shows agents how to combine gadgets to form the gadget they need.