Unit 3 · Measurement and Data
41 Days Later — What Day of the Week?
Lesson 8 of 12
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About this lesson
11 August 1999 was a Wednesday. What day was 21 September 1999? The whole challenge is counting the days in between correctly (20 remaining in August + 21 in September = 41), then using remainder division to find which day of the week that lands on.
Chapters
0:00Introduction
0:24The Question
0:52Calculating days remaining in August
1:16Finding total days elapsed
1:35Working with weekly cycles (modulo arithmetic)
2:02Shifting the day and final selection
2:22Strategic exam tip
2:54Correct answer
Question
11th August 1999 was a Wednesday.
Which day of the week was 21st September 1999?
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