Question

What is the estimated value of the expression if each number in the expression is rounded to the nearest whole unit?

(4.18)(1.93)(8.72)

Answer 1

@whpalmer4 Umm i got 0

Answer 2

use the calculator to do this. Or there is not permited to use it?
your answer is not correct if the sing between the ( ) is multiplication

Answer 3

ty

Answer 4

okay, if we round to the nearest whole unit, what are the rounded off values of 4.18, 1.93 and 8.72?

Answer 5

hmm

Answer 6

"nearest whole unit" means "nearest counting number"

Answer 7

"unit" <--> "1" in this context

Answer 8

Okay....let me think. Btw this is my worst topic ever

Answer 9

Have no fear, I'm here :-)

Answer 10

Okay :3 well........

Answer 11

4.18 - is that closer to 4, or 5?

Answer 12

4

Answer 13

very good. if we use my method from previous problem, we are rounding to the 1's place, so we add 0.5

4.18
+0.5
-----
4.68
drop everything after the place where we are rounding
4

our first number is (4)

how about the next two?

Answer 14

lol

Answer 15

this not the place for this

Answer 16

like u said;

Answer 17

There....now where were we?

Answer 18

Okay, so we had "simplified" our expression from

\[(4.18)(1.93)(8.72)\] to
\[(4)(1.93)(8.72)\]
but we still need to round the second two numbers before multiplying to get our estimate

Answer 19

Okay

Answer 20

what is the nearest counting number to 1.93?

Answer 21

2?

Answer 22

as an old math teacher of mine used to say when someone answered without conviction in their voice, "is that an answer, or a prayer?" :-)

Answer 23

Lol X'D 2

Answer 24

that's better! How about the third one?

Answer 25

9

Answer 26

correctamundo. so now we have which 3 numbers to multiply together?

Answer 27

uh 4*2*9

Answer 28

:_:

Answer 29

which equals...

Answer 30

=72

Answer 31

excellent! if we'd done the problem as originally stated, we would have 70.347728
so our estimate is pretty good, and a lot less work!

Answer 32

Thank you (:

Answer 33

you're welcome, of course

Answer 34

So it would be 70.347728 or do with take off some numbers?

Answer 35

70.34 O.O

Answer 36

No, the answer is 72. I'm just telling you what we would have gotten if we hadn't done an estimate, but instead multiplied the 3 original numbers in all of their magnificence :-)