Add a sequence from one to a selected
             2-digit number

1. Choose a 2-digit number.
2. Multiply the 2-digit number by half the next number, or
   Multiply half the 2-digit number by the next number.

   Example:

1. If the 2-digit even number selected is 51:
2. The next number is 52. Multiply 51 times half of 52.
3. 51 x 26: (50 x 20) + (50 x 6) + 1 x 26) =
   1000 + 300 + 26 = 1326
4. So the sum of all numbers from 1 through 51 is 1326.

   See the pattern?

1. If the 2-digit even number selected is 34:
2. The next number is 35. Multiply half of 34 x 35.
3. 17 x 35: (10 x 35) + (7 x 30) + (7 x 5) =
   350 + 210 + 35 = 560 + 35 = 595
4. So the sum of all numbers from 1 through 34 is 595.

With some multiplication practice you will be able to find these sums of sequential numbers easily and faster than someone using a calculator!