By MACMILLAN

The center strategies

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Jack is 2 years younger than Selma. Write an expression that represents the sum of their ages. y + (y + 5) + (y − 2) = 3y + 3 19 FOOD The school cafeteria pays $54 per case for chicken wings. Each case contains b wings. w $54/b, $54 _ or $54 ÷ b b Correct the mistakes. ” Alonso’s answer is shown. What mistake did he make? 150 ÷ a He should have used multiplication instead of division. The number of photos that a albums can hold is actually 150 · a, or 150a. Chapter 3 Test 41 Chapter 3 Standards Practice Choose the best answer and fill in the corresponding circle on the sheet at right.

Mark gets $3 less than Brooke. Katrina gets twice as much as Mark. The expression n + 2n + (2n − 3) + 2(2n − 3) represents the total of the four allowances. Simplify the expression. ) 33 9n - 9 SCHOOL In Mrs. Garcia’s class, students can earn points for free books. Mrs. Garcia’s bulletin board shows how many points a student can earn. Sergio earned some As and some Bs. He had perfect attendance for the same number of weeks as he earned As. The expression 20a + 15b + 2(20a) represents the number of points that Sergio earned.

3(2)2 + 4 · 3 - 2 4÷y+x·3-7=4÷2+5·3-7 2. Simplify using the order of operations. 4÷2+5·3-7 2. Simplify using the order of operations. 3(2)2 + 4 · 3 - 2 Divide. = 3(4) + 4 · 3 - 2 =2+5·3-7 Multiply. = 12 + 12 - 2 = 2 + 15 - 7 Add. = 22 = 17 - 7 Subtract. = 10 Who is Correct? Evaluate the expression 12x - 5 + 2x · 2 when x = 4. Ines Sinclair 12x - 5 + 2x · 2 2 = 12(4) - 5 + 2(4) · = 48 - 5 + 8 · 2 = 43 + 8 · 2 12x – 5 + 2x · 2 2 = 12(4) - 5 + 2(4) · = 48 - 5 + 8 · 2 = 48 - 5 + 16 12x - 5 + 2x · 2 = (12x + 2x) - 5 · 2 = 14x - 10 = 14(4) - 10 = 46 = 59 Circle correct answer(s).