The first day of the last menstruation of a woman was the 10th of June, 2026…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
The first day of the last menstruation of a woman was the th of June, 2026.
- The expected date of birth is days later. On which day of the month does it fall?
- In which month is it? Give the number of the month, with January as .
- On the th of November, 2026, how many complete weeks have passed since the th of June? The number of days from the th of June to the th of November is .
Need a reminder? The key ideaShow
The inner cell mass forms three germ layers. The ectoderm forms the skin and the nervous system. The mesoderm forms the muscles, the skeleton, the heart and the blood. The endoderm forms the lining of the gut and organs such as the liver. The heart forms after one month. A full pregnancy lasts days, or weeks, from the first day of the last menstruation. The expected date is the date of the last menstruation plus days.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. Last menstruation: the th of June, 2026. Pregnancy: days.
Plan. Use the rule of days and months. Check it by adding days.
Step 1. The rule. for the day. June minus months is March. Add one year, to .
Step 2. Check. From the th of June, 2026 to the th of March, 2027 is days. Seven more days make , which is the th of March, 2027.
Step 3. Weeks so far. complete weeks.
Answer: the th; month number (March); weeks.
Check. Both ways give the th of March, 2027.
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