Tuesday

September 30, 2014

September 30, 2014

Posted by **Julie** on Monday, October 12, 2009 at 7:22pm.

- 3rd grade Math -
**Mika**, Monday, October 12, 2009 at 8:17pmBenchmark numbers are easier to add-usually ending in 0's or 5's.

Ex:

28+31 can be turned into 30+30. 28 was rounded up to 30, and 31 was rounded down to 30.

4 and lower is rounded down; 5 and higher is rounded up. If the number is 3,4,5,6 or 7 it is rounded to five, if you're getting more specific.

I hope this helps; but I'm only in 6th grade so I'm not sure (:

**Answer this Question**

**Related Questions**

math - Writing in math, how can estimating help you add two-digit numbers?

3rd grade - How can estimating help you add two-digits numbers?

math - How can estimating help you add two-digit numbers?

math - how can estimating help you add two- digit numbers?

math - how can estimating help you add two-digit numbers?

math - how can estimating help you add two- digit numbers?

3rd grade math - Using four different digits, what is the least sun you can get ...

3rd grade - using four different digits, what is the least sum you can get when ...

3rd grade - using four different digits, what is the least sum you can get when ...

estimating - how does estimating help add 2 digit numbers