Easy Multiplication Shortcut 26

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Easy Multiplication Shortcut 26

Multiplying a repeating 1's number by 55

• Select a repeating 1's number (111, etc.)
• Multiply it with 55
• The product is:
• first digit is 6
• next digits are repeating 1's, two fewer than repeating 1's in the original number
• last two digits are 05.

 Ex:1
If the first number is 111111:
Multiply by 55. The product is:
first digit is 6: 6
next digits are 1's, two fewer than 1's: 1111
last two digits are 05
Then 111111 × 55 = 6111105.
Ex:2
If the first number is 1111:
Multiply by 55. The product is:
first digit is 6: 6
next digits are 1's - two fewer than 1's: 11
last two digits are 05
Then 1111 × 55 = 61105.

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