When rounding up, we look at the digit to be rounded up and see if it is up to 5
if it is below 5, we would take the lower value. if it is greater than or equal to 5, we would take the upper value.
Looking at the given figure, 83 is between 80 and 90. Since 3 is lesser than 5, we would take the lower value. Therefore, it is closest to 80
