Saturday, August 4, 2012
Identical Girls
In the following image, four girls are exactly the same. In 20 seconds, can you identify them?
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| Find Four Identical Girls |
Answer:
Wednesday, August 1, 2012
Numerical Maze of Divisibles by 6
In 10 minutes or less, find a path from the START to the END passing only through numbers that are divisible by 6. Note that there is only one solution for this numerical maze.
To make you find numbers divisible by six faster, here is a hint to remember and apply:
If the sum of the digits of a number is divisible by 3 AND its last digit is even then that number is divisible by 6. For example, 612 is divisible by 6 because the sum of its digits, nine (6 + 1 + 2 = 9), is divisible by 3 and its last digit, two, is an even number.
If the sum of the digits of a number is divisible by 3 AND its last digit is even then that number is divisible by 6. For example, 612 is divisible by 6 because the sum of its digits, nine (6 + 1 + 2 = 9), is divisible by 3 and its last digit, two, is an even number.
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| Numerical Maze of Divisibles by 6 |
Answer:
Tuesday, July 31, 2012
Numerical Maze of Divisibles by 12
Find a path from the START to the END passing only through numbers that are divisible by 12. There is only one solution for this numerical maze. To solve this maze faster, first learn the following three mental math hints:
1) If a number is divisible by 3 and by 4 then the number is divisible by 12.
2) If the sum of the digits of a number is divisible by 3 then the number is divisible by 3. For example, 2130021 is divisible by 3 because 9, the sum of its digits (2 + 1 + 3 + 0 + 0 + 2 + 1 = 9), is divisible by 3.
3) If half of a number is an even number then that number is divisible by 4. For example, 72 is divisible by 4 because half of it, 36, is an even number. Also, if the last two digits of a number is divisible by 4 then that number is divisible by 4. As an example: 897232 is divisible by 4 because its last 2 digits; i.e. 32, is divisible by 4.
Answer:
1) If a number is divisible by 3 and by 4 then the number is divisible by 12.
2) If the sum of the digits of a number is divisible by 3 then the number is divisible by 3. For example, 2130021 is divisible by 3 because 9, the sum of its digits (2 + 1 + 3 + 0 + 0 + 2 + 1 = 9), is divisible by 3.
3) If half of a number is an even number then that number is divisible by 4. For example, 72 is divisible by 4 because half of it, 36, is an even number. Also, if the last two digits of a number is divisible by 4 then that number is divisible by 4. As an example: 897232 is divisible by 4 because its last 2 digits; i.e. 32, is divisible by 4.
Answer:
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