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learn for later

Learn the secrets of mental math and improve your calculation skills with this comprehensive guide. Master addition, subtraction, multiplication, and division through various techniques and exercises. Discover how to solve complex problems and become fluent in mental math.

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learn for later

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  1. learn for later Utrecht, August 27, 2019 willem uittenbogaard

  2. what is mental math? • OUT of yourhead (byheart) • WITH yourhead

  3. what must? OUT of yourhead: • + and – till 20 • time tablesandtheir reverse • home on thenumber line • handywithzeros in multiplication • lots of friends: the more, thebetter

  4. what more? WITH yourhead: • stringing + and – till 100 and 1000 • column wise + and – • column wise ×: one digit × two digit numbers • divisionbymultiplying up • use of a calculator in time

  5. the smallest candy shop in the world

  6. Stijn leaves the shop with 7 things for € 1.what’s in his bag?

  7. the candy stroopsoldaatje 25 cent wijnbal 15 cent zoethout 10 cent schuimblok 5 cent

  8. smallest candy shop • the smallest number of things you can buy is 4 • the biggest number of things you can buy is 20 • can you buy any number of things between 4 and 20? • are you sure? • can you prove it?

  9. some results of the lesson

  10. pieces of rope a teacher needs, for a lesson, pieces of rope of 2.75 meter; she has a ball of rope of 80 meters. • howmany pieces canshe get out of that?

  11. piecesof rope • can you solve it? • how? • why is it so difficult? • can children solve it? • can grown ups solve it?

  12. reactions on the market • french fries • just a woman

  13. multiplying up

  14. starting problem the teacher gets a new electric bicycle for his birthday. then he can go to school on that bike. a full battery is good for 90 kilometers. • the teacher lives 6.25 kilometers from the school. • how often can the teacher cycle back and forth to school before recharging the battery?

  15. some results of the starting problem

  16. some results of the rope problem

  17. all my recent work • http://www.fi.uu.nl/publicaties/subsets/lesvandemaand/

  18. learn for later Some sides are much better than others!

  19. e-mail: w.uittenbogaard@uu.nl homepage: www.staff.science.uu.nl/~uitte104

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