In this video, a person selects one number from each of the five rows of any calendar month. Then without seeing the numbers chosen, a second person can predict the sum of the five numbers by just knowing the number of Sundays, Mondays, Tuesdays, Wednesdays, Thursdays, Fridays, or Saturdays chosen. This is illustrated in a classroom demonstration, and then explained by several examples using different calendar months.
Tagged under: calendar,key sum,convenient numbers,adding,addition,number sense,combining numbers,increasing numbers,decreasing numbers
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1. Students enter a simple code
2. You play the video
3. The students comment
4. You review and reflect
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