Substact the sum of 27 and -421 from 121

According to the question 121 (27+( 421)) =121 (27 421) =121 (6 421) =121 221 =1 221 = 121 ...

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Estimating Sum or Difference

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Question

Substact the sum of $\frac{2}{7}$ and $- \frac{4}{21}$ from $\frac{1}{21}$

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