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Diagnose a Decimal Comparison Error
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ParaPro
PPM.145 Diagnose a Decimal Comparison Error
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A student says 2.099 is greater than 2.1 because 099 has more digits than 1. Which prompt best supports the correct comparison?
A
Ask the student to write 2.1 as 2.100 and compare 99 thousandths with 100 thousandths.
B
Ask the student to compare 99 and 1 as whole numbers.
C
Ask the student to ignore the decimals and compare only the whole-number part.
D
Tell the student that 2.099 is greater because it is written to thousandths, based on the given work.
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