Multiplying a 2-digit number by 55 (method 1)

1. Select a 2-digit number.
2. Multiply it by 50. (An easy way to do this is to take half of it (divide by 2), then add two zeros.)
3. Add 1/10 (one-tenth) of the product. (Take off the last zero of the product and add this number to the product.)

   Example:

1. The 2-digit number chosen to multiply by 55 is 28.
2. 50 x 28 = 1400 (half of 28 is 14; add 2 zeros).
3. 1400 + 140 = 1540 (add 1/10 of the product - take off last zero).
4. So 28 x 55 = 1540.

   See the pattern?

1. If the number to be multiplied by 55 is 62:
2. 50 x 62 = 3100 (half of 62 is 31; add 2 zeros).
3. 3100 + 310 = 3410 (add 1/10 of the product - take off last zero).
4. So 62 x 55 = 3410.