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**MIND-Xpander **Logic Problem

You have a piece of paper, 10 cm. by 10 cm. Area = 100 cm². For some reason, you need a square piece of paper with an area of 50 cm². Using the paper you have, what’s an easy way of getting the new square?

**Algebraic ** challenge

By replacing each question mark with an algebraic sign (+, -, x and /), solve the following equations for the answers as shown:

( 6 ? 4) ? 12 = 12

(7 ? 3) ? (4 ? 1) = 26

(4 ? 2) ? (4 ? 3) = 24

(6 ? 5) v (9 ? 2) = 19

**Chinese Multiplication **puzzle

Also known as a lattice method, the Chinese method provides an easy way to multiply any two numbers without the aid of a calculator. In the following puzzles, some or part of the multiplied or added values are provided. The object of this puzzle is to find the missing values to determine the original numbers that when multiplied together gives you the correct product as shown on the bottom line. Find these missing values.

### Solution

**MIND-Xpander Logic Problem**

Fold the 4 corners into the middle to get an area of 50 cm².

**Algebraic challenge**

(6 x 4) – 12 = 12 (7 x 3) + (4 + 1) = 26 (4 / 2) x (4 x 3) = 2 (6 – 5) + (9 x 2) = 19

**Chinese Multiplication maths puzzle**

486 x 2,938 = 1,427,868

## Feedback

There are more than one way of doing these puzzles and may well be more than one answer. Please let me and others know what alternatives you find by commenting below. We also welcome general comments on the subject and any feedback you'd like to give.

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Algebraic Challenge

(6 x 4) – 12 = 12

(7 x 3) + (4 x 1) = 26

(4 – 2) x (4 x 3) = 24

(6 – 5) + (9 x 2) = 19

MIND-Xpander

For each of the 4 sides of the original square, mark the mid point; join these mid points together to form a new square having half the area of the original square.

QUISIERA RECIBIR EM MI CORREO, LOS PUZZLES ANTERIORES Y FUTUROS, CON LAS SOLUCIONES PARA SABER SI LO HICE BIEN Y QUE ESTEN ESCRITOS EN CASTELLANO, MUCHAS GRACIAS , ANIBAL TANNEUR.-