CurrentGK General Knowledge Mathematical Tricks

Multiplying A Repeating 4s Number By 42
Multiplying a repeating 4's number by 42 Choose a repeating 4's number (444, etc.) Multiply it by 42 The product is:
- first two digits are 18
- next digits are 6's -- two fewer than the repeating 4's in the original number
- last two digits are 48.

....
Multiplying A Repeating 4s Number By 36
Multiplying a repeating 4's number by 36 Choose a repeating 4's number (444, etc.) Multiply it by 36 The product is:
- the first two digits are 15
- the next digits are repeating 9's (two fewer than repeating 4's in the original number)
- the last two digits are 84 ....
Multiplying A Repeating 4s Number By 31
Multiplying a repeating 4's number by 31 Choose a repeating 4's number (444, etc.) Multiply it by 31 The product is:
- the first two digits are 13
- the next digits are repeating 7's (two fewer than repeating 7's in the original number)
- the last two digits are 64 ....
Multiplying A Repeating 4s Number By 28
Multiplying a repeating 4's number by 28 Choose a repeating 4's number (444, etc.) Multiply it by 28 The product is:
- the first two digits are 12
- the next digits are repeating 4's (two fewer than repeating 4's in the original number)
- the last two digits are 32 ....
Multiplying A Repeating 4s Number By 24
Multiplying a repeating 4's number by 24 Choose a repeating 4's number (444, etc.) Multiply it by 24 The product is:
- the first two digits are 10
- the next digits are repeating 6's (two fewer than repeating 4's in the original number)
- the last two digits are 56 ....
Multiplying A Repeating 4s Number By 22
Multiplying a repeating 4's number by 22 Choose a repeating 4's number (444, etc.) Multiply it by 22 The product is:
- first digit is 9
- next digits are 7's - two fewer than the repeating 4's in the original number
- last two digits are 68.

....
Multiplying A Repeating 4s Number By 17
Multiplying a repeating 4's number by 17 Choose a repeating 4's number (4444, etc.) Multiply it by 17 The product is:
- the first digit is 7
- the next digits are repeating 5's (two fewer than repeating 4's in the original number)
- the last two digits are 48 ....
Multiplying A Repeating 4s Number By 15
Multiplying a repeating 4's number by 15 Choose a repeating 4's number (4444, etc.) Multiply it by 15 The product is:
- the first digits are 6's -- the same number as the repeating 4's in the original number
- the last digit is 0    Example: If the first ....
Multiplying A Repeating 4s Number By 14
Multiplying a repeating 4's number by 14 Choose a repeating 4's number (4444, etc.) Multiply it by 14 The product is:
- the first digit is 6
- the next digits are repeating 2's (two fewer than repeating 4's in the original number)
- the last two digits are 16 ....
Multiplying A Repeating 4s Number By 13
Multiplying a repeating 4's number by 13 Choose a repeating 4's number (4444, etc.) Multiply it by 13 The product is:
- the first digit is 5
- next repeating digits are 7's -- one fewer than repeating 4's in the original number
- the last digit is 2 ....

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