Regifting robin how does it work

One way to show this is to test all the numbers which, in a class, could be broken down so one group does 10s, another 20s and so forth. So the answer is a multiple of 9. Gather up 10 small cups and something to use as counters jelly beans, candies, pennies, whatever. To represent the number 37, you could put 3 counters in each of the 10 cups and then 7 singles outside of the cups. You could use this method to represent any 2 digit number. Now remove all the counters outside of the cups as that would be like subtracting the b from the number ab.

Subtract one of those by removing 1 cup. Tip: To turn text into a link, highlight the text, then click on a page or file from the list above. This Sidebar appears everywhere on your workspace. Add to it whatever you like -- a navigation section, a link to your favorite web sites, or anything else.

Get a free wiki Try our free business product. To edit this page, request access to the workspace. Regifting Robin Page history last edited by Bob Mann 4 years, 2 months ago. Then submit a document here that contains A description of how the game works how does the computer get the answer An explanation of the mathematics that makes it work A short summary of how you came up with that solution A power-point created by a former student on how to solve the problem.

Mann's Summary as a word document Mann's summary here: First, on Problem-Solving in general: Many of you accurately provided MP1 problem-solving and perseverance as an example of a covered MP and you are absolutely right. Then, for the Regifting Robin problem in particular: Once you get to the point of knowing the answer is always a multiple of 9 and that the computer uses this to properly arrange and pick the gifts, the challenge is explaining why it must be a multiple of 9.

Here are some options: 1. Many of you provided some sort of explanation with examples, 42 becomes 36; 84 becomes 72, etc. You or your students could actually test out all the 2 digit numbers to prove the result: One way to show this is to test all the numbers which, in a class, could be broken down so one group does 10s, another 20s and so forth. What they would find is that 10, 11, 12, MathChat Calendar.

Category Overview. Email Subscription. Follow Following. MathChat Join other followers. Sign me up. Already have a WordPress. Log in now. Post was not sent - check your email addresses! Check Registing Robin's gift table. See what gift is in the cell 9, cell 18, cell 27, and all the other multiples of 9. The same gift???! No matter what numbers A and B we picked, if we did our math correctly, we get to a cell that is a multiple of 9 and all these cells contain the same gift.

No wonder Robin can guess this gift! Play again and you will see that a different gift is randomly selected but again all the cells that are multiples of 9 have the same gift. What a fun mass dillusion! Subscribe to our weekly newsletter to get more of such fun tricks by email. Posted by Maria at PM Challenge your friend.

Life is a Puzzle! Email Address:. Our weekly newsletter with stories, puzzles and ideas can spice up your weekend and help present math to your family as a toy and a friend. Labels: easy , life. April 23, at AM Anonymous said Tom April 23, at AM Maria said A puzzle point for KJ! Thanks again for sharing this great trick with us, Tom. April 23, at PM. RSS Feed.

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