Well,
To round to the nearest ten, you round the number in the ones column up or down, depending on the number. In 1356's case, you round the 6 up, which rounds the number up to the nearest 10 = 1360.
To the nearest hundred, you do the same, except with the ten's column. In this case it rounds up to 1400.
The thousands column is - you guessed it - the same but with the hundred's column. In this case, you round it down, so it will be 1000.
