Posted by Hayley on .
You want to estimate 5.253.3. Why would using frontend estimation and adjusting tell you more about the answer than rounding?

5th grade Math 
MathMate,
Frontend estimation consists of doing the calculation with the most significant one or two digits, and examining the following truncated digit to see if an adjustment is required.
Here we would subtract 3 from 5 to get 2. Since .25 and .3 are close, we don't need an adjustment and accept the estimate as 2.
Therefore in this particular case, both methods give the same answer, and probably as quickly.
Personally I prefer frontend estimation because it works from left to right, which is more intuitive. In general, it works faster and better. Best of all, it adapts to the person's math capability.
Doing rounding and then the calculations takes a lot of intermediate memory which is often beyond the capacity of the ordinary person.
On the other hand, the front end estimation allows the person to calculate from left to right, with one, two or three digit accuracy. The answer is immediate and there is less chance of errors. 
5th grade Math 
c,
i do not know

5th grade Math 
angela,
68.99+22.31

5th grade Math 
cashlin (cool girl),
.9230

5th grade Math 
Grace,
92

5th grade Math 
madi,
??????
i don't get it 
5th grade Math 
jess,
What????????

5th grade Math 
rea,
how to estimate using front end with adjustment

5th grade Math 
Alena,
How do I estimate the sum or difference by using frontend estimation with adjustment? 5,974 + 6,459
Please help 
5th grade Math 
Kathy,
12,000

5th grade Math 
Garfield,
meow meow meow lasagna