Top Drawer Teachers: Five Times
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Top Drawer Teachers The Australian Association of Mathematics Teachers (AAMT) Inc. http://topdrawer.aamt.edu.au
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Top Drawer Teachers: Five Times
- 1. Here are three sets of 10. How many sets of 5 are there? Five times
- 2. There are 2 fives in each 10 so it must be 6. There are 2 fives in each 10 so it must be 6. Five times
- 3. So what is 6 x 5 ? Five times
- 5. So what is 8 x 5 ? Five times
- 7. 2 x 10 = 4 x 5 3 x 10 = 6 x 5 4 x 10 = 8 x 5 5 x 10 = 10 x 5 Here is a pattern of the answers we have found. What do you notice? Five times
- 8. 2 x 10 = 4 x 5 3 x 10 = 6 x 5 4 x 10 = 8 x 5 5 x 10 = 10 x 5 Five times I can see doubling and halving I can see doubling and halving
- 9. 2 x 10 = 4 x 5 3 x 10 = 6 x 5 4 x 10 = 8 x 5 5 x 10 = 10 x 5 Give me an example? Five times
- 10. 2 x 10 = 4 x 5 3 x 10 = 6 x 5 4 x 10 = 8 x 5 5 x 10 = 10 x 5 Five times 4 is doubled to get 8 10 is halved to get 5 4 is doubled to get 8 10 is halved to get 5
- 11. 2 x 10 = 4 x 5 3 x 10 = 6 x 5 4 x 10 = 8 x 5 5 x 10 = 10 x 5 What should go on this card? Five times
- 12. 2 x 10 = 4 x 5 3 x 10 = 6 x 5 4 x 10 = 8 x 5 5 x 10 = 10 x 5 Five times It should be 3½ x 10 = 7 x 5 It should be 3½ x 10 = 7 x 5
- 13. 2 x 10 = 4 x 5 3 x 10 = 6 x 5 4 x 10 = 8 x 5 5 x 10 = 10 x 5 So what is 7 x 5? Five times 3½ x 10 = 7 x 5
- 14. 2 x 10 = 4 x 5 3 x 10 = 6 x 5 4 x 10 = 8 x 5 5 x 10 = 10 x 5 Five times 3½ x 10 = 7 x 5 3535