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Identify and Correct Mistakes Involving Order of Operations
Worksheet
Grade Level
Grade 5
5.80 Identify and Correct Mistakes Involving Order of Operations
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🔴 Hard
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Olivia evaluated: 9 × (16 − 19) + 12 × (3 + 9). Olivia's work: 9×16-19+12×3+9 = 170. Which choice correctly identifies the order-of-operations mistake and gives the correct value?
A
Error: Ignored parentheses in both products; compute each parentheses first. Correct value: 170.
B
Error: Ignored the parentheses; compute inside parentheses first. Correct value: 972.
C
Error: Ignored parentheses in both products; compute each parentheses first. Correct value: 117.
D
Error: Changed the grouping; you cannot move operations into or out of parentheses. Correct value: 117.
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