1 is the whole number, 1.82 rounded to whole number is" 2 "(because 8 is more than 4)
1 5 1
1.82 rounded to the nearest whole number is 2...
because the rule states that if the number beside(right) the decimal point is 5 or more, you have to round up to the next whole number which is 2.

hope that would help....
credits to
it might  be very hard to explain.... thanks to you.

2 3 2