Assume that all numbers are approximate. (A) estimate the result and (b) perform the indicated operations on a calculator and compare with the estimate. 3.64(17.06)?

Question

Assume that all numbers are approximate. (A) estimate the result and (b) perform the indicated operations on a calculator and compare with the estimate.  3.64(17.06)?

anonymous · Answer

i did for the estimate 4*15=60 or should it be 4*20=80 and then for the clculated i got 62.0984 what should that be rounded to? @loser66

loser66 · Answer

Sorry, I don't get what you mean. what is the  problem? where 4*15 or 4*20 come from?

anonymous · Answer

its a significant digit thing

anonymous · Answer

i have to make an estimate result and then i have to calculate the actual problem

loser66 · Answer

Can I see the problem?

anonymous · Answer

sure

anonymous · Answer

estimate 
3.64(17.06)

calculate 3.64(17.06)

loser66 · Answer

one more question: is it from chemistry class? If it is so, then you are right when you take the first number rounded to 4 and second one rounded to 20
However, if it is not from chemistry, you cannot rounded like that.

anonymous · Answer

its from technical mathmatics 1 class we have been doing alot of significant digits stuff and i wondering do we have to do it like that

loser66 · Answer

@SithsAndGiggles

anonymous · Answer

Wait, I had that wrong. When you multiply, you round up to the least number of sig figs of the factors. In this case, it's 3, since 3.64 has three sig figs. So you'd round the product to 62.1

anonymous · Answer

okay i have 61.1 now for the estimated is it 3*15 or 3*20

anonymous · Answer

I think 4*15 is good enough

anonymous · Answer

okay thank you