Level: CM The French Gerard Aboville crossing the Pacific solo in a rowing boat in 1991
Sailing 07/11/1991 Japan - Arriving on 11/21/1991 in the USA, on the ship "Sector", 8 meters long and 1.80 meters wide. It gave an average of 17 paddle strokes per minute, rested 10 minutes per hour and rowed 11 hours a day.
1. In your opinion, without making any calculations, how many strokes of the oar that browser he provided throughout this trip?
1000 oar strokes, 10 000 strokes of the oar; 100 000 strokes of the oar; one million oar strokes
2. Now do the math and compare with your initial response. Are you surprised?
References:
"Problems for the round 3-Math, a tool for understanding Worldwide Michèle and Dominique Valentin Apple Hatier p28 (note: there is an error on the number of days in the correction)
This book of photocopiable sheets offers many original problems for CE2, CM1 and CM2, classified by themes (animals , space, body ...)
worked Skills:
- know the units of measure time (month, day, hour, minute) and their relationships
- organize and process calculations additive, subtractive and multiplicative
procedure possible:
- set the context of the problem (which is the Pacific ...)
- ALL one estimate
- determine the stage of research one to one or trying to anticipate all:
- number of days
- number of strokes in an hour
- number of strokes in a day
- number of strokes total
- comparison of results obtained with the estimate made at the outset
Extensions possible:
from the news of Bernard FRIOT "Mathematics" in "again pressed stories" Milan Junior pocket (it can find the text of the new there) there are plenty of calculations "crazy" to do. This is a child whose mother is a math teacher, who in retaliation for a harassment Mathematical daily engaged in some calculations derogatory to mark the anniversary of his mother.
I would strongly advise to "stories squeezed" by Bernard Friot (4 volumes) as a whole. These new stuffed humor are an excellent support for work in French.
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