Step by step
1. Take your number.
76,340
2. Underline the number you are trying to round in this case the 6.
76,340
3. Look at the number to the right of the underlined number.
76,340
4. If the number to the right if 5 or higher you change the underlined number up one and, if the number to the right is lower keep it the same. Change the remaining numbers to the right to zeros.
76,000
5. Now you've got your answer!