Posted by **Busy 6** on Monday, April 7, 2008 at 7:49pm.

Elly writes the following expression on the blackboard.

(13+24)+0+7

Use three properties of addition to simplify the expression. Include the names of the properties you use.

what properties of addition are there cause im not sure!!!!

- Math-help!!! -
**drwls**, Monday, April 7, 2008 at 8:15pm
One property is that any number PLUS zero is the same number.

Another property is that it makes no difference in which you do the operations. That is called the commutative property.

The various properies of additiona are listed here:

http://www.aaamath.com/pro74a-propertiesadd.html

See which others you need. In this case, you just add them all up, so I don't see what the big deal is.

- Math-help!!! -
**Busy 6**, Monday, April 7, 2008 at 8:38pm
thanx a lot!!!

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