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7.NS.A.1b / 7.NS.A.1c - Addition and Subtraction of Rational Numbers (Part 1 of 2)
By MathwithMrAlmeida
Watch Mr. Almeida fully explain how to add and subtract rational numbers using vectors and the concept of a number line.
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.
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.
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).
Integer addition and subtraction: number line interpretation
By Khan Academy
Interpreting integer expressions
Addition and subtraction with number lines | 2nd grade | Khan Academy
By Khan Academy
Sal figures out which number line matches up with a 2-digit addition or subtraction problem.
Addition and Subtraction of Rational Numbers (Part 1 of 2)
By MathwithMrAlmeida
Addition and Subtraction of Rational Numbers (Part 1 of 2)
Addition and subtraction with significant figures | Decimals | Pre-Algebra | Khan Academy
By Khan Academy
This video shows us the rules for adding and subtracting measurements to show our level of accuracy. Note that the rules for addition/subtraction with significant figures are VERY different than the rules for mulitplication/division. Think about which number is the most precise!
solve word problems using addition and subtraction of fractions
By Kathleen Twyman
how to solve a word problem using addition and subtraction of fractions
CBSE class 8-Chapter 1-Addition & Subtraction of Rational numbers
By Escholarindia Faridabad
Addition & Subtraction of Rational numbers
Vectors : scalar multiplication, addition and subtraction : ExamSolutions
By ExamSolutions
Youtube Presents Vectors : scalar multiplication, addition and subtraction : ExamSolutions an educational video resources on english language arts.
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.
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.