Showing posts with label math fun. Show all posts
Showing posts with label math fun. Show all posts

Friday, February 3, 2012

The Beauty Of A Rectangle

Look around, you see rectangular objects everywhere, for instance, computer screen, laptops, Desks, Books, Newspaper, cell phones, greeting cards, gift wrappers, paintings, calendars, doors, windows, closets, calculators, towels, bed sheets, photographs, color boxes, note books, dining table, mirrors, credit cards and the list goes on and on. Have you ever wondered why so many people have been drawing and building things that are rectangular shaped?

The ancient Greeks discovered that there is a specifically shaped rectangle that is most pleasing to the eye. It is not too thick, not too thin but just right. The rectangle possessing this characteristic is called the “Golden Rectangle”. If you simply draw what you believe to be the most beautiful rectangle, then measure the lengths of each side and finally divide the longest length by the shortest. You’ll probably find the ratio is somewhere around 1.6, which is called the golden ratio, rounded to the nearest tenth.
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Wednesday, February 1, 2012

Cool Multiplication

Here's an easy way to find out square of a two digit number.
I) Let's square a two digit number that ends in 5. (without using your calculator :))
For example, we would like to square the number 65.
Step 1: Multiply the first digit of a number with the next number that comes after it. In this case 7 comes after 6.
6x7=42
Step 2: Now place 25 after it.
4225

Well, 65X65 = 4225
By the way, 5 is my favourite number. What's yours?

II) Let's square any two digit number.
For example 27.
Step 1: Look for the nearest ten boundary, which is 30 (27+3=30).
Step 2: Now go down 3 numbers from 27.
=24
Step 3: Multiply 24X30 = 720 (answer 1)
Step 4: 27 is 3 from nearest ten boundary 30
Now square of 3 = 9 (answer 2)
Step 5: Add (answer1) and (answer2)
720+9 = 729

27X27 = 729 comments

Friday, January 27, 2012

Find out on which day you were born?

Have you ever wondered which day of week you were born? I guess yes! So lets find out using simple math to find the day of the week on which you were born.
Finding the month number!
We know that January has 31 days. A week has 7days so every date in February will be 3 days later than the same day in January. (28 is 4 weeks exactly. 28+3=31). For instance, if January 1st of any given year falls on Saturday, February 1st of that year will be 3 days later. That is on Tuesday. Following the same pattern for all the months, the following table is calculated.
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