Round off or add zeros to three significant figures 65.659

65.700

To round off the number 65.659 to three significant figures, we look at the digit in the fourth significant figure, which is 9. Since 9 is greater than 5, we round up the last digit. Therefore, the rounded number with three significant figures is 65.7.

If instead of rounding off, you want to add zeros to make the number have three significant figures, you would add the necessary zeros after the decimal point. In this case, since 65.7 already has three significant figures, no additional zeros need to be added.