Question

Quick one
Estimate the value of 60.22 + 21.17 + 3 x 33.2 by using the compensation strategy.

Answer 1

60 + 20 + 100 = 180

Answer 2

It's not?!

Answer 3

The answer at the back of my book is 181. Also, if you don't mind, can you explain how you get the answer?

Answer 4

It is 60 + 21 + 100 = 181 is the answer...

Answer 5

Can you further explain it?

Answer 6

I'm confused because you're like doing it using reformulation strategy.

Answer 7

In Approximation in case of decimal numbers,for example if I have 50.4, then you can take it as 50 but if it is 50.5 then you will take it as 51...
For 1 2 3 4 digits after decimal you will take that number only but if you have 5 6 7 8 9 after decimal then you can add 1 to that number as I did...

Answer 8

But what about ''compensation strategy'' ?

Answer 9

I don't know the compensation strategy...

Answer 10

I can handle the question using reformulation strategy.. That's probably what you've mentioned. But when it comes to compensation strategy, I can do nothing but sitting here, using reformulation strategy again. That why I asked here to see if I can seek help. By the way, thanks for your help.

Answer 11

Can you tell me somewhat about what is compensation strategy??

Answer 12

The line from the book is ''Get a better estimate by making adjustment''
And the example is:
Estimate 2316x5
Step 1: Replace 2316 by 2000, then 2000x5 = 10000
Step 2: In order to obtain a better estimate, replace 316 by 300. So, we have 300 x 5 =1500.
Step 3: Combine the results in Steps 1 and 2. The estimate value = 10000 + 1500 = 11500.

Answer 13

estimation is a real guessing game... I just work on the most obvious... and round to the nearest 10 or possibly 5