When rounding to a specific place, take a look at the digit immediately to the right of the target, in this case, the tens place. If that digit is 4 or less, zero everything to the right of the target out. If that digit is 5 through 9, increase the target by one and zero everything to the right of it out. If the target is a 9, increasing it will turn it to zero and increase the digit to the left of the target by one.
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700
678 to the nearest cent is 678.00
200
686.98 rounded to the nearest whole number is 687. When rounding a decimal number to the nearest whole number, you look at the digit immediately to the right of the decimal point. If that digit is 5 or greater, you round the whole number up by 1. In this case, the digit to the right of the decimal point is 9, so we round 686.98 up to 687.
Well, darling, to find 33 and 1/3% of 678, you simply divide 678 by 3 to get one-third of the total. Then multiply that result by 33 to get the final answer. It's basic math, sugar, nothing to lose sleep over. Just grab a calculator and get 'er done!