B. 6 x 100 = 600
The number of s.f or rounding off
An estimate is an educated guess based on prior knowledge. Rounding off is knowing the exact value but rounding it to the nearest whole number.
Option D *Rounding 18 to 20, and 20x20=400
An Estimate is basically a guess. Rounding is when you have an answer and you shorten the answer to a given number of digits. eg $27482 would round to $27500 to the nearest hundred dollars.
It is 59.
There is only one number, 2633211987 in the question so why estimate?
That's the "rounding" process.
OK, I understand. Give me the number to be rounded, and I'll do that.
You use rounding TO estimate. For instance, estimating is 2.8 + 3.9 is about 7. Rounding is 2.8 is about 3 and 3.9 is about 4. When you estimate, you're rounding MULTIPLE numbers which you will then add, multiply, etc. to get an ESTIMATE! when you're rounding, you need to be given a certain number and you make it less specific. for example, the population of whoville is 693044. if I'm rounding to the nearest thousand, then the answer is 693000. numbers 5 and up are rounded up. numbers 4 and below are rounded down. when you're estimating, you're basically making an educated guess without knowing the real number. for example, you're looking at a bag of jellybeans and you guess there's 750 in there. it seems like a reasonable number so you estimate that.
22.807000000000002
It is 5 + 4 = 9.
Rounding is when you take a decimal or fraction and make it the closest whole number. If the number you are rounding is five or higher round up and if it's four or below round down. For instance, 7.2 rounds down to 7, 6.8 rounds up to 7.