The Story Puzzle of Sliced ​​Bread

At that time in a bakery there is a mother with a son. The owner of the bakery seems already quite familiar with this customer. When the mother is busy talking about his order to the owner of the store, the boy kept staring at a big carrot cake with a mature crust and a layer of vanilla in it. Apparently the store owner memperhatika the child. Then he filed a tempting offer.

"I will give the tart for you if you can solve this little puzzle," said the shopkeeper. "How can so I can cut this round tart into 16 pieces are exactly the same only with four slices straight?"

The child immediately said, "How many ways Mr. want?"

"Just one way. But remember, all the slices must pass vanilinya layer. "

"Oh ... yes, you were right. Indeed, there's only one kind of way. With two slices perpendicular, Mr. will acquire four pieces. Then lined up all four pieces before and iris once again be straight in the middle row. Well, Mr.'ve got eight pieces. Furthermore, these eight pieces lined up again. The fourth straight slices will produce 16 pieces of the same. How ... right? "

"Exactly, Jake. Here, tart it now belongs to you all. "

The mother insisted to pay the tart, but the shop owner refused.

The boy and his mother thanked the owner of the shop and hurried home (of course, along with the tart).

Read more at:

Puzzle adventure Dr. Ecco, written by Dennis Shasha, published in Jakarta by grants in 1995.

Challenging questions about Simple assessment

This question can be given to students who are learning decimal units to provide basic calculations and provide an assessment of a very large number. A simple question that challenges to stimulate simple assessment one of which is as follows.

I want to count to one million.1, 2, 3, 4, 5, ...How long does it take?

Of course, this is an open-ended question. The answer could be a variety of conditions. It could be when spell is interspersed stop, or can also be in spell the numbers constantly. In the case of simple assessment, it can be said that the number takes about one second to be spelled, and if they do not stop counting until finished it will take about one million seconds.

As a sequel, in terms of studying the decimal unit, then be directed to the state of one million seconds into a simpler form, for example by converting into units of minutes, hours, or days. These issues provide a good opportunity to emphasize the ability of the assessment.

1,000,000 seconds to change to the day we need to calculate:

For a quick calculation, round 24 to 25, so that:

Because more than 10, then a good estimate is 11 days. The real answer is approximately 11 ½ days.

Read more at:

Teaching Mathematics Third Edition: a resource book props, activities, and strategies, written by Max A. Sobel and Evan M. Maletsky, published in Jakarta by grants in 2004.

Just Math: Math for All

Bismillah ...

Just Math?

Is this expression impressed underestimate mathematic? Definitely no, it’s not! This is an expression of hope that many people do not feel horrified by mathematics. The phrase "Just Math" is also intended to demonstrate that a variety of information, stories, and whatever is in my writings are essentially turns on only about mathematics, whether related to basic mathematics, logic, or whatever they are called. Essentially "Just Mathematics", but if from reading these writings gain other than math lessons, then that is a bonus!

Starting from the field of mine who is a college math, I want everyone from all fields of life to know various information about mathematics. Quite a lot of information about this math simple but very interesting, impressive and unexpected, in addition to interest on the math is daunting, complicated, tedious, and so on. Through the medium of this simple, I will refer to that share some knowledge and information I have about mathematics. Science and this information comes from various sources: my notes during the education of elementary, junior high school, to college, including my notes when ever the race and the like, or from what I've heard and I've read. Most reference books listed as the source of my writings is my favorite books. I can confirm that these books have a good enough quality to be enjoyed by fans of mathematics, but also did not rule out the possibility of these books can be easily understood by everyone. Therefore, with my share through my writings is later expected to be more interested in reading this kind of books, and also can be used as a source of information to support other references related. At least my writings could be read your leisure time.

I say thank you to all the viewers who took time to visit and read, may be able to feel the benefit of these writings. Aameen .. I would like to apologize profusely when writing in this media is nothing that makes you less pleasing. I begged the correction of viewers over my writings, if there is something wrong or inaccurate. Please criticism and constructive suggestions to be submitted to me. Thanks for all your attention and cooperation.

Hope it is useful…