Question

students were asked to decompose 67.485. their responses are recorded in the chart
rose 674 tenths + 85 thousandths
michael 67 ones + 4 tenths + 85 thousandths
george 6 tens + 7 ones + 48 tenths + 5 thousandths
courtney 67,485 thousandths
select the student who has made an error.
courtney
george
michael

Explanation:

Step1: Convert Rose's response to number

$674 \times 0.1 + 85 \times 0.001 = 67.4 + 0.085 = 67.485$

Step2: Convert Michael's response to number

$67 \times 1 + 4 \times 0.1 + 85 \times 0.001 = 67 + 0.4 + 0.085 = 67.485$

Step3: Convert George's response to number

$6 \times 10 + 7 \times 1 + 48 \times 0.1 + 5 \times 0.001 = 60 + 7 + 4.8 + 0.005 = 71.805$

Step4: Convert Courtney's response to number

$67485 \times 0.001 = 67.485$

Step5: Identify incorrect response

Compare each result to 67.485; George's result does not match.

Answer:

George