Writing Expressions Examples Write each phrase as an expression. 1). The sum of 6 and a number. 6 + x (any letter is fine) 2). Ten less than a number x. X-10 W 3). The sum of 6 times a number and 7. 6 y + 7 (any letter is fine) 4). Eight times the sum of y and six. 8(y+6) 5). Five notebooks that cost $0. 75 each and 6 5(0. 75) + 6 y (any letter is fine) or pencils. $3. 75 +6 y

Writing Equations Examples Write each sentence as an equation. 1). The sum of three times a number and six is seven. 3 X + 6 = 7 2). The product of 6 and y is 42. 6 y=42 3). Jake’s age divided by 3 equals ten. 4). Two more than the number of dogs is 18. D+ 2 = 18 5). Ten pounds less than twice her weight is 90. 2 W-10= 90

Practice Write each as an expression or equation. 1). Ike’s weight divided by 2. 2). Two times a number plus six equals 16. 2 x + 6 = 16 3). The quotient of 16 and y is 8. 4). Three less than a number times six. 6 X-3 5). Jeff purchased 7 gumballs for $0. 25 each and 3 pieces of gum. He spent a total of $2. 05. How much did each piece of gum cost? Write the equation for this problem. 7(0. 25) + 3 x = $2. 05 or $1. 75 + 3 x=$2. 05

Closure Write the following expression in words three different ways. 2 x + 3