Multiplying three digit number by 143

1. Select a 3-digit number.
2. Repeat the 3 digits to produce a 6-digit number.
3. Divide by 7.

Example:

1. The 3-digit number chosen to multiply by 143 is 123.
2. Repeat 3 digits: 123123
3. Divide by 7: 123123/7 = 17589
4. So 143 × 123 = 17,589.