To round 6.437 to two decimal places, you look at the third decimal place, which is a 7 in this case. Since 7 is 5 or greater, you round up the second decimal place by adding 1 to it. Therefore, 6.437 rounded to two decimal places is 6.44.
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1.556621881 rounded to zero decimal place = 2
16.44
The only way to do this is by adding a zero after the 2 digit in the decimal.
When you round to 2 decimal places you will take the decimal portion which is .575 and look at the 3rd decimal place to the right which is 5. If this number is 5 or above you will round the second decimal place up 1 and if it is less than 5 you will keep it how it is. So in your case you will round the 7 up one because the 3rd place is 5 or above. Your answer will be 684.58 Hope this helps :)
That depends on what you want to round it to, like one decimal place or a whole number, as in the following examples: One decimal place: 1.7 A whole number: 2