Month: November 2011

Blog Carnival #17 Deadline

Blog Carnival

The Math and Multimedia Carnival is on its 17th edition and will be hosted at Mathematics for Teaching.  The deadline of submission is on November 26. To submit your articles, click here.

The latest carnivals are the following:

I will also be hosting the 83rd edition of the Carnival of Mathematics. The deadline of submission is on November 30.  To submit your articles to the Carnival of Mathematics, click here.

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Divisibility by 5 and 10

Number Theory

This is the third post in the Divisibility Rules Series.  The first was about divisibility by 2 and the second was about divisibility by 4.  In this post, we discuss divisibility by 5 and 10.

If we skip count by 10, we will immediately realize that the numbers always end in zero: 10, 20, 30, 40, and so on. It is clear that all multiples of 10 end in 0; therefore,  a number is divisible by 10 if the ones digit is 0.

On the other hand, if we skip count by 5, then we have 5, 10, 15, 20, 25, 30 and so on. Notice that if we add 5 to a number whose ones digit is 5, the ones digit of the sum is 0. Similarly, any number whose ones digit is 0 added to 5, the ones digit of the sum is always 5.  Hence, we conclude that a number is divisible by 5, if the ones digit is either 5 or 0.

From here, we can see clearly that all numbers that are divisible by 10 are also divisible by 5.

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Mathematics and the Love of God?

Math Lite

Got this from a forwarded email. You might want to share it.

If:

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Is represented as:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26.

If:

H-A-R-D-W-O-R- K

8+1+18+4+23+15+18+11 = 98%

And:

K-N-O-W-L-E-D-G-E

11+14+15+23+12+5+4+7+5 = 96%

But:

A-T-T-I-T-U-D-E

1+20+20+9+20+21+4+5 = 100%

THEN, look how far the love of God will take you:

L-O-V-E-O-F-G-O-D

12+15+22+5+15+6+7+15+4 = 101%

Therefore, one can conclude with mathematical certainty that:

While Hard Work and Knowledge will get you close, and Attitude will
Get you there, It’s the Love of God that will put you over the top!

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