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Mr. Gifford’s 5 th Grade Math Class Lesson #22 Variables and Expressions

Mr. Gifford’s 5 th Grade Math Class Lesson #22 Variables and Expressions. Variables and expressions are the beginnings of a new area of math for a 5 th graders called Algebra. Algebra is a type of mathematical puzzle. Algebra includes patterns that you must solve to find an answer.

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Mr. Gifford’s 5 th Grade Math Class Lesson #22 Variables and Expressions

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  1. Mr. Gifford’s 5th Grade Math Class Lesson #22 Variables and Expressions

  2. Variables and expressions are the beginnings of a new area of math for a 5th graders called Algebra. Algebra is a type of mathematical puzzle. Algebra includes patterns that you must solve to find an answer.

  3. A variable is a letter or symbol that represents an unknown amount that can vary or change. Symbols that are commonly used. X, A, B, Y, or any letter to represent a word.

  4. When you use a Variable along with a number you create an Algebraic Expression. This is a mathematical phrase involving variables, numbers, and operations.

  5. Here are some examples of these Algebraic Expressions There are NO equal signs in these expressions A number plus or added to 4 N + 4 A number minus or less 4 N -4

  6. 4 times a number 4w A number divided by 4 N / 4 or N 4

  7. Here are some questions that involve these algebraic expressions Twice the number of people This means 2 times the amount of people that are ALREADY there. 2 (for twice)p(for people) 2p

  8. $7 less than the current price P (for the price) $7(price less than) P-7

  9. 8 more gumballs the Javier has J (for Javier)+8(for the number of more gumballs J+8

  10. A number of students divided into 2 teams. S(for the students) / 2 (number of teams) S/2 or S 2

  11. Now let’s practice with some of these expressions. Subtract a number from 10 10 - N

  12. The product of 9 and a Number 9n Add 6 to a number 6 + N

  13. 6 divided by a Number 6 / N Now let’s try to make written expressions from a number expression.

  14. Make an Expression for N + 9. 9 more than a Number Make an Expression for X / 12 A number divided by 12

  15. Make an expression for y - 4 A number minus 4 Make an expression for 8m 8 times a number

  16. Now that you have looked at and practiced working with variables and expressions you can now practice on your own. Thank you for your time and good luck. Remember to practice your multiplication facts.

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