89999
9 * 1010. Because there are 10 zeros in the number.
90 thousand billion
9.3372
85
The answer is 4000 because 99 is closest to 000 (or 100) not 90
About 90 000 seconds or 90 000 000 000 000 nanoseconds.
The number 90 is already rounded to the nearest ten.
To round 87 to the nearest ten, a person needs to look at the number in the ones place. If the number is 5 or higher, the tens place rounds up. If it's lower, then it rounds down. The number 87 would round up to 90.
90
To round 95 to the nearest ten, you would round it down to 90.
90 000 000
90 000 000