Perimeter Side Lengths Videos - Free Educational Videos for Students in K - 12

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Finding perimeter when a side length is missing | Math | 3rd grade | Khan Academy

By Khan Academy

Lindsay finds the perimeter of a figure when a side length is not given.

      Introduction to perimeter

      By Khan Academy

      Find perimeter by adding side-lengths of various figures.

          Perimeter 2

          By Khan Academy

          Find perimeter by adding side-lengths of various figures.

              Finding perimeter

              By Khan Academy

              Find perimeter by adding side-lengths of various figures.

                  Identifying proportional relationships

                  By Khan Academy

                  Is the perimeter of a square proportional to the side length of the square?

                      Grade 3 Math Perimeter 3 MD 8

                      By EngageNY

                      Solve real world problems involving perimeters of polygons, including finding the perimeter given the side lengths and finding an unknown side length

                          Estimating Products |


                          This lesson covers perimeter. Students learn that the perimeter of a figure is the distance around the figure, so the perimeter of a figure can be found by adding the lengths of its sides. Since all four sides of a square are equal in length, the perimeter of a square that has a side with a length of 8 feet is 8 + 8 + 8 + 8, or 32 feet. Since opposite sides of a rectangle are equal in length, the perimeter of a rectangle that is 4.5 meters by 6.2 meters is 4.5 + 4.5 + 6.2 + 6.2, or 21.4 meters.

                              Perimeter |


                              This lesson covers naming angles. Students learn the definition of an angle and the concept of measure, including the following vocabulary: side, vertex, protractor, degrees, right angle, acute angle, obtuse angle, and straight angle. Students also learn what assumptions can and cannot be made from a given figure.

                                  Surface Area of a Pyramid |


                                  This lesson covers the definition of perpendicular lines. Students learn the definition of perpendicular lines and use algebra to find the measures of angles in problems that involve perpendicular lines. Students are also asked to determine whether given information is sufficient to determine if two lines are perpendicular.

                                      Perimeter Word Problems |


                                      This lesson covers the area of a trapezoid. Students learn that a trapezoid is a quadrilateral with one pair of parallel sides, and the formula for the area of a trapezoid is 1/2 times (base 1 + base 2) times height. For example, the area of a trapezoid that has bases of 10 centimeters and 12 centimeters and a height of 8 centimeters is 1/2 times (10 + 12) times 8, which simplifies to 1/2 times 22 times 8, or 11 times 8, which is 88 square centimeters.

                                          3rd Grade Math Rap

                                          By McCarthy Math Academy

                                          With a little help from the group, Mindless Behavior, I have created a math video with lyrics to help my students to understand and apply core math skills for third grade. People of all ages can jam out to this one. Enjoy!

                                          I've got a case of the operation blues.
                                          Because I don't know which one I should use.
                                          Look at the word problem for the clues.
                                          The key words tell you how to choose.

                                          Each means you multiply or you must divide.
                                          Tryna find the total? Then you multiply
                                          Total's in the problem? Then you must divide.
                                          Not quick to solve it, draw it, get it right.

                                          Addition's easy for me and you
                                          Sum, In all, together, and total too.
                                          When do you subtract? How many more?
                                          Fewer? Left? Less? Difference in a score?

                                          Place value's next. Disco on the " dess "
                                          Ones, tens, hundreds, to the left
                                          Thousands, Ten thousands, hundred...thousand
                                          Say the name of the place, yeah.

                                          The value's the amount of the place
                                          For example, 2,060.
                                          The value of the 2 is 2-0-0-0,
                                          The value of the 6 is 6-0.

                                          When you round, find and underline the place
                                          Spotlight to the right, decide the digit's fate
                                          5 or more, add 1 to the rounding place
                                          4 or less, do nothing but walk away, (estimate)

                                          A pen, penny is one, one cent
                                          A Nic-kel is five, a dime is ten cents
                                          25 for a quarter, George Washington
                                          100 cents makes a dollar, there he goes again.

                                          For pictographs, you gotta check out the key
                                          One smiley face might really equal three
                                          For bar graphs, pay attention to the scale
                                          Think it's counting by ones, huh, you'll fail

                                          Fractions are easy, just draw your best.
                                          Here they go from least to greatest
                                          1/12, 1/6, ¼, 1/3,
                                          ½, 2/3, ¾, Fraction nerd!

                                          You see that number on top,
                                          That's called the numerator
                                          It describes the amount
                                          That is being considered
                                          And if you jump down from the fraction bar
                                          It's the total number of equal parts.

                                          Let me give you an example:
                                          Leslie Moin has some coins
                                          A total of 9
                                          2 happen to be pennies
                                          While 7 are dimes.
                                          What's the fraction of dimes?
                                          How many coins? 9
                                          How many dimes? 7
                                          Say the fraction -- seven ninths

                                          Length times width is Area
                                          Distance around is Perimeter
                                          Break down the GEOMETRY

                                          3 sides makes triangle
                                          4 sides = quadrilateral
                                          5 pentagon, 6 hexagon
                                          8 octagon, 10 decagon

                                          Lines that never cross - PARALLEL
                                          Lines that meet or cross - INTERSECTING
                                          Lines that form right angles -- PERPENDICULAR

                                          Same shape, same size -- CONGRUENT
                                          Line that cuts in half - SYMMETRY
                                          Up and Down - VERTICAL
                                          Left to Right -- HORIZONTAL

                                          An angle less than right - ACUTE
                                          An angle opened wide - OBTUSE
                                          Ninety degrees square corner - RIGHT ANGLE

                                          Back to triangles
                                          3 sides the same = equilateral
                                          2 sides the same = isosceles
                                          no sides the same = Hey, that's a scalene right!

                                          So, that's it.
                                          That's our math song.
                                          Before we leave,
                                          Remember to read
                                          Your math problems three times before you answer.
                                          That way you know what the problem
                                          Is asking you to do.
                                          Don't be lazy, be brilliant.
                                          Piece! Like a fraction.

                                              2nd Grade Math Compilation


                                              2nd Grade math is fun with these learning videos! Each lesson can help students with word problems, math games or help prepare for a test! Great for a review of 2nd grade or for an introduction!

                                                  Learn XY Coordinate Plane, Graphing Points, Lines & Distance - [5-9-15]

                                                  By Math and Science

                                                  Quality Math And Science Videos that feature step-by-step example problems!