Shen’s mother gave him $10 to go buy groceries. He picked up a gallon of milk for $3.49, three pounds of oranges that cost $1.14 per pound, and a box of cereal for $3.46. Shen used front-end estimation to determine whether he had enough money for the groceries. How much did he estimate the total cost would be?
Answer
A
He estimated that he had about $7 worth of groceries.
B
He estimated that he had about $9 worth of groceries.
C
He estimated that he had about $10.30 worth of groceries.
D
He estimated that he had about $10.40 worth of groceries.
Explanation
Front-end estimation uses the leading place value, here the whole-dollar amounts. Estimate the milk at $3, the three pounds of oranges at $3 total ($1 per pound × 3), and the cereal at $3. Adding those estimates gives $3 + $3 + $3 = $9, so Shen estimated about $9 worth of groceries.
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