Super Short Trick For 10 consecutive numbers:

Tricks



  • For 10 consecutive numbers use: Sum = n/2 ​(First + Last)

  • For 10 consecutive numbers use :

  • Mid-Number Trick : 10 consecutive numbers: Take the 2 middle numbers, find their average, then × 10.


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For 10 consecutive numbers use : = 5 × (First + Last)


1. 161 to 170



2. 171 to 180



3. 211 to 220



Note: 10 numbers → Add first + last → × 5


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Mid-Number Trick : 10 consecutive numbers: Take the 2 middle numbers, find their average, then × 10.


1) 161 to 170


Middle numbers = 165, 166



There are 10 numbers:


Ans: 1655



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