Ask them to tell you the answer. Then mentally subtract The remainder gives the answer, beginning with the right-hand digit of the answer.

The right-hand digit 3 tells you the string is on the third finger. The left-hand digit tells you it is Player 6 who has the string. Published by Sterling Publishing Co. Stay tuned for more Math Tricks. They will be added from time to time, so be sure to check in again. Math Tricks for All Ages This web page is devoted to the incredibly boffo idea that math can be fun! If you're using Netscape, Do Not Scroll down the page while this loads.

Play at Shoot Balls. Play Flippo Test your knowledge of the multiplication tables. Try your hand at estimation. Explore Geometry in a fun and interactive way. Try the Tower of Hanoi Puzzle. See what a Spriograph is. See what a Mandelbrot set is.

## Math Tricks for All Ages

Try it, you'll like it. But remember we were first. Magic Addition Trick 1 Amaze the peons with this one. It's simple. It's effective. It gets them every time. Ask your mark to pick three 3 different numbers between 1 and 9. Tell him or her or her or him to write the three numbers down next to each other, largest first and smallest last, to form a single 3-digit number.

Next have her or him form a new 3-digit number by reversing the digits, putting the smallest first and the largest last. And write this number right underneath the first number. Now have him or her subtract the lower and smaller 3-digit number from the upper and larger 3-digit number. Tell them not to tell you what the result is.

## One half - Wikipedia

Now you have a choice of wrap-ups: Ask your friend to add up the three digits of the number that results from subtracting the smaller from the larger 3-digit number. Then amaze him or her by teling them what the sum of those three numbers is. The sum of the three digit answer will always be 18! Tell your friend that if she or he will tell you what the first OR last digit of the answer is, you will tell her or him what the other two digits are.

This is possible because the middle digit will always be 9, and the other two digits will always sum to 9! So to get the digit other than the middle one which is 9 and other than the digit that your friend tells you, just subtract the digit your friend tells you from 9, and that is the unknown digit. Back to Top Magic Square 15 Every row and column sums to 15 in this magic square.

### See a Problem?

So do both diagonals! Some necessary rules and definitions: Let the letters a , b , and c stand for integers that is, whole numbers. Always choose a so that it larger than the sum of b and c. This guarantees no entries in the magic square is a negative number. This quarantees you won't get the same number in different cells.

### Fractions of shapes

Using the formulas in the table below, you can make magic squares where the sum of the rows, columns, and diagonals are equal to 3 X whatever a is. Back to Top Upside Down Magic Square Here's a magic square that not only adds up to in all directions, but it does it even when it's upside down! If you know the trick, you will never lose, and will probably will most times.

Just follow these easy steps: Shuffle the cards to mix them thoroughly. Deal out 36 cards into a pile. Ask a friend to pick one of the 36 cards, look at it and memorize it, and then put it back in the pile without letting you see it.

Shuffle the 36 cards. Lay the 36 cards out in 6 rows of 6 cards each. Be sure to deal the top row from left to right. Then deal the second row beneath it from left to right. Grade 3 Develop understanding of fractions as numbers. Explain why the fractions are equivalent, e. Recognize that comparisons are valid only when the two fractions refer to the same whole. Grade 4 Extend understanding of fraction equivalence and ordering.

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