Discussion
Find the value of 0.002100+0.21+0.000021?
Answer: A
The value is 0.212121.
Line the decimals up by place value:
\[ \begin{aligned} &0.002100 \\ +\ &0.210000 \\ +\ &0.000021 \\ =\ &0.212121 \end{aligned} \]
The other options come from misaligning the digits, for example treating 0.21 as 0.021.
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