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.

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