math problem??????

Question

estimate this math problem:

4.9% of 81 =

Best answer 10 points

Answer 1

Well, 4.9% is about 5% and 81 is about 80 (since we're estimating).

Since 5% is the same as 5/100 and that simplifies down to 1/20. If you multiply

1/20 X 80/1 = 80/20 which simplifies down to 4/1 or 4.

The best estimate is 4.

Answer 2

If you're looking for one answer that's best, you'll be hard-pressed as many people are likely to get this right. I'll give it a go:
4.9% of 81 = (4.9*81)/100
= 396.9/100
= 3.969
4.9% of 81 is 3.969

Answer 3

The word of means to multiply in math.

You need to change 4.9% into a decimal by moving the decimal point two places to the left.

So, 4.9% becomes 0.049.

Next:

Multiply 0.049 times 81 to get: 3.969.

We can now round off 3.969 to the nearest unit also known as THE ONES PLACE. See it?

Final answer: About 4

Guido

Answer 4

it easy to plug into a calculator and get the answer,
but estimation needs a bit of thought

4.9 is slightly less then 5%
81 is slightly more then 80 so if we take 5% percent of 80 we would be very close. 10 percent of 80 is 8, so 5 percent of 80 is 4.

thank you

Answer 5

4.9% to 5%
81 to 80

5% x 80

roughly 4

Answer 6

Let us change the percent to 0.049. (just simply move the decimal point 2 places to the left.)

Multiply 0.049 to 81.

0.049(81)=3.969

The real answer is 3.969.

*How to estimate it?

Simply estimate 4.9% to 5% and 81 to 80 (Use the rules of rounding off numbers). Then make it 0.05.

80(0.05)=4

The answer would be approximately equal to 4.

Answer 7

hmm my estimation

4.9=5%
81=80
5% of 80 should be around 4

Answer 8

5% of 80 is 4

Answer 9

4.9% = .049

type this in on a calculator:

.049*81

Answer 10

4.9%=.049 so .049*81=3.969

if you just want an estimate
.05*80=4