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For rounding off to nearest ten, we have to consider the digit at ones place. If the digit at ones place is less than 5 then the digit at tens place remains same but the digit at ones place is written zero. Rounding off 41 to the nearest ten : 40.
Rounding off 18.998 involves looking at the digit in the thousandths place, which is 8. Since 8 is greater than or equal to 5, we round up the digit in the hundredths place by 1. Therefore, rounding off 18.998 results in 19.
When rounding in hundreds place, look slat the tens place, if the digit is 5 and up then you round the hundreds place up to the next digit. If it is 4 and below then you retain the digit of the hundreds place. Example in rounding to tens place, 450 rounds to 500 while 449 rounds to 400. Same principle in rounding to thousands except you look at the hubdreds place digit when considering to round off. Example in rounding to thousands place. 4500 rounds to 5000 while 4499 rounds ro 4000.
When rounding to a specific place, take a look at the digit immediately to the right of the target. 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.
The basic rule rule for rounding off to the relevant number of significant figures is :- If the first figure to be discarded is 5 or more, the previous figure is increased by 1When rounding to the nearest 1000 (which is the same as to the nearest multiple of 1000) then the first figure to be discarded is the digit representing the hundreds. In this question that digit is "2". As this is less than 5 then the previous figure is notincreased by 1.36257 is thus rounded to 36000.