Lumos Video Store
This page provides a list of educational videos related to Add and Subtract Mentally. You can also use this page to find sample questions, apps, worksheets, lessons , infographics and presentations related to Add and Subtract Mentally.
How to Pass the Math FSA (4th) - Add and Subtract
By McCarthyAcademy
how to solve 4th Grade FSA Math-style problems. The standard covered in this video is MAFS.4.NBT.2.4
Subtracting 1 vs. subtracting 10 | Addition and subtraction within 100
By Khan Academy
Sal talks about the difference between subtracting 1 and subtracting 10.
Missing numbers in addition and subtraction | 2nd grade | Khan Academy
By Khan Academy
Sal solves missing number in problems like 73 = ___ + 57.
Relate addition and subtraction
By Khan Academy
See the relationship between 2+3=5, 5-2=3, and 5-3=2.
Addition and subtraction trig identities
By Khan Academy
Sal evaluates the cosine of twice an������������angle whose right triangle is given. To do this, he must use the cosine double-angle formula.
Addition and subtraction trig identities
By Khan Academy
Sal evaluates the cosine of the sum of 60������������ and another angle whose right triangle is given. To do this, he must use the cosine angle addition formula.
Addition and subtraction with number lines
By Khan Academy
Sal figures out which number line matches up with a 2-digit addition or subtraction problem.
More examples of addition and subtraction of polynomials | Algebra II | Khan Academy
By Khan Academy
This instructor in this video, Sal Khan, discusses adding and subtracting polynomials. In an easy, conversational tone, the instructor explains processes clearly. Mr. Khan uses the Paint Program (with different colors) to illustrate his points. Sal Khan is the recipient of the 2009 Microsoft Tech Award in Education. The student or educator may want to open the video to 'full screen' as the instructor is using a black background and the writing is small.
Addition and subtraction trig identities
By Khan Academy
Sal reviews all the different trigonometric angle addition identities: sin(a+b), sin(a-c), cos(a+b), cos(a-b), cos(2a), and sin(2a).
Addition & Subtraction of Mixed Numbers: With Same Denominators
By Red River College -Tutoring
Addition & Subtraction of Mixed Numbers: With Same Denominators
solve word problems using addition and subtraction of fractions
By Kathleen Twyman
how to solve a word problem using addition and subtraction of fractions
Two-Digit Addition Regrouping Tens and Ones: Grade 2
By university of Houston mathematics education
The video describes how elementary students can solve an addition word problem regrouping tens and ones.
[4.NF.3a-1.0] Intro to Fraction Addition - Common Core Standard
By Freckle education
Understand a fraction a/b with a greater than 1 as a sum of fractions 1/b. Understand addition and subtraction of fractions as joining and separating parts referring to the same whole.
[4.NF.3a-1.0] Intro to Fraction Addition - Common Core Standard - Word Problem
By Freckle education
Understand a fraction a/b with a greater than 1 as a sum of fractions 1/b. Understand addition and subtraction of fractions as joining and separating parts referring to the same whole.
Grade 2 math 11.10a adding and subtracting money (dollars and cents)
By Joann's School
How to add or subtract money in vertical form as the amounts stacked one on top of the other. A two part word problem is included involving addition and subtraction of money.
Subtracting 1 vs. subtracting 10 | Addition and subtraction within 100 | 2nd grade | Khan Academy
By Khan Academy
Sal talks about the difference between subtracting 1 and subtracting 10.
ADDITION & SUBTRACTION OF RATIONAL EXPRESSIONS WITH DIFFERENT DENOMINATORS (ANIMATION)
By Jerry Llevada
ADDITION & SUBTRACTION OF RATIONAL EXPRESSIONS WITH DIFFERENT DENOMINATORS (ANIMATION)
Matrix addition and subtraction
By Khan Academy
Sal defines what it means to add or subtract matrices. He shows a few examples and discusses some important properties of matrix addition and subtraction.
Integer addition and subtraction: number line interpretation
By Khan Academy
Interpreting integer expressions
Solving One Step Equations By Addition and Subtraction
By Mathispower4u
Video about solving one step equations by addition and subtraction.