Homework Help: Math

Posted by B.B. on Saturday, June 20, 2009 at 9:01am.

Name the property that justifies each step.
[(2x100)+(3x10)]+[(1x100)+(5x10)]
= (2x100)=[(3x10)+(1x100)]+(5x10) I think this is Commutative
= (2x100)+[(1x100)+(3x10)]+(5x10) I think this is Distributive property
=[(2x100)+(1x100)]+[(3x10)+(5x10)] I think that this is Associative property.
=[(2+1)x100]+[(3+5)x10] I think that this is the Distributive property.
= (3x100)+(8x10) This is Basic facts.
=380 Expanded form to standard form.
Is this all correct? Thanks for your help.

Math - Anonymous, Saturday, June 20, 2009 at 4:04pm
No
Math - B.B., Saturday, June 20, 2009 at 5:00pm
Then can you help me with it?

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