Solve Problems with Coins Videos - Free Educational Videos for Students in K - 12

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Systems of Equations Word Problems

By yourteachermathhelp

For a complete lesson on systems of equations word problems, go to - 1000+ online math lessons featuring a personal math teacher inside every lesson! In this lesson, students learn to solve number and value word problems using a system of linear equations, as demonstrated in the following problem. Rodolfo has a total of 17 dimes and quarters worth $3.05. How many of each coin does he have? The two variables used in this problem are d, number of dimes, and q, number of quarters. Since Rodolfo has a total 17 dimes and quarters, one equation is d + q = 17. Since the value of his coins is $3.05, the other equation is 10d + 25q = 305. Note that since d represents the number of dimes, 10d represents the value of the dimes. And since q represents the number of quarters, 25q represents the value of the quarters.

      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.