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Writing Expressions

Writing Expressions. Expressions vs. Equations. Expressions use numbers, number symbols and letters (variables) to explain a sentence. Equations are like expressions except they have an equal sign. examples. twelve divided by three 12 ÷ 3. Twenty increased by eleven 20 + 11.

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Writing Expressions

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  1. Writing Expressions

  2. Expressions vs. Equations • Expressions use numbers, number symbols and letters (variables) to explain a sentence. • Equations are like expressions except they have an equal sign.

  3. examples • twelve divided by three • 12 ÷ 3 • Twenty increased by eleven • 20 + 11 • Thirty-seven minus a number • 37 - n

  4. Real life problem • Joey mows lawns to make some extra money. He charges $21 for each lawn and an extra $2 per hour. Which expression should he use to find out how much to charge his customers? [A] 21 + h [B] 21 + 2·h [C] 21 + 2 [D] 21 – 2·h

  5. Translating words into symbols

  6. Example problems • Twelve pieces of candy equally shared by four friends • 12 ÷ 4 • The product of seven and four • 7 x 4 • The difference of Twenty and sixteen • 20 – 16 • y less than 18 times 6 • 18•6 – y

  7. Example problems • Seven decreased by five 7 – 5 • The product of four and nine 4 x 9 • The sum of a number and ten m + 10 • Eight more than a number c c + 8

  8. Example problems • The quotient of twenty and two 20 ÷ 2 • Five minus a number x 5 – x • Five less than a number x x – 5 • Eighteen equally shared by six 18 ÷ 6

  9. Example problems • Three times the sum of a number and 5 3 x (n + 5) • The quotient of m and 2 plus 7. (m ÷ 2) + 7 • four times the quantity of x minus 8 4 x (x – 8) • Eight more than the product of a number and 9 c + 8

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