In the decimal representation of the number $1 / 7$, the 2013th digit after the decimal point was crossed out (while other digits were not changed). Did the number increase or decrease?
After dividing the numerator by the denominator, we get that 1/7 = 0.(142857). This means that the period of the resulting fraction contains 6 digits. Since the number 2013, when divided by 6, gives a remainder of 3, the 2013th digit after the decimal point in the decimal representation of the number $1 / 7$ is the third digit of the period, which is the digit 2. After crossing out this digit, the digit 8 will stand in its place. Therefore, the original number has increased.

## Answer

Increased.