A woman's last menstrual period began on 1 March with regular 28-day cycles. Using Naegele's rule, what is her estimated due date (day and month)?

Answer and explanation

Correct answer: B. 8 December

  1. Step 1: Naegele's rule: add 7 days to the first day of the last period and subtract 3 months (or add 9 months).
  2. Step 2: The estimated due date is 8 December.
Answer
8 December.
Why not the others: '1 December' forgets to add 7 days; '24 November' subtracts 7 days instead of adding; '15 December' adds 14 days instead of 7.

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