15. Equations Talk About


Remember: a number sentence with an equals sign (=) is called an equation.


We must equate, or equalise, the numbers on each side of the equals sign.


1. Try solving these equations. a) 179 + 283 = d) 108 ÷ 12 =


b) 654 – 92 = e) 6 = 126 ÷


c) 8 × 14 = f) 450 +


= 982


The blank in question 1 is a variable because it does not always represent the same number. Instead of the blank, we can use another variable represented by a letter.


For example, Sarah shared out her sweets among 6 of her friends. Each person got 12 sweets.


How many sweets did Sarah have at fi rst?


Let x be the number of sweets Sarah had at fi rst. x ÷ 6 = 12 x = 72


Strand: Algebra


Curriculum Objectives: Translate word problems with a variable into number sentences; solve one-step number sentences and equations.


105


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