Posted by **David** on Monday, January 11, 2010 at 6:58pm.

Estimate a range for each sum.

3.89 + 42.71 + 12.32

I don't understand what to do for "estimating a range".

- 6th Grade Math -
**Ms. Sue**, Monday, January 11, 2010 at 7:02pm
The range is the numbers that the answer must fall between.

3.89 = about 4

42.71 = about 43

12.32 = about 12

Add those numbers in your head -- 59

The range must be 58 - 60

- 6th Grade Math -
**David**, Monday, January 11, 2010 at 7:05pm
Thanks!!!

- 6th Grade Math -
**Ms. Sue**, Monday, January 11, 2010 at 7:12pm
You're welcome.

- 6th Grade Math -
**Anonymous**, Monday, January 11, 2010 at 11:23pm
35642÷65846

- 6th Grade Math -
**hannah**, Tuesday, January 12, 2010 at 7:59pm
why do eskimos wash their clothes in tide? Don't understand what the answer is

- 6th Grade Math -
**Faith**, Wednesday, November 12, 2014 at 7:47pm
First do front end estimation which is just adding the whole numbers. Round the decimals to either 0.50 or 1. Add it to your answer for the whole numbers. Last add it to the decimal answer and your range is going to be bweetn your whole number answer and your total answer you have for adding the decimals and whole numbers

- 6th Grade Math -
**Faith**, Wednesday, November 12, 2014 at 8:29pm
How do you do pi and trigonometry?

- 30th Grade Math -
**boy**, Saturday, November 15, 2014 at 2:07pm
nope

- 6th Grade Math -
**Marek**, Sunday, November 30, 2014 at 11:33pm
what if you do all those steps but somehow it still wrong?

- 6th Grade Math -
**Clarice**, Saturday, December 13, 2014 at 10:12pm
Front end estimation will answer the question for you

From Google:

Front end estimation mostly produces a closer estimate of sums or differences than the answer produced by adding or subtracting rounded numbers.

How to estimate a sum by front end estimation:

Add the digits of the two highest place values

Insert zeros for the other place values

Example 1: 4496 + 3745 is estimated to be 8100 by front end estimation (i.e. 4400 + 3700).

Example 2: 4496 + 745 is estimated to be 5100 by front end estimation (i.e. 4400 + 700).

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