Posted by **Sandy** on Wednesday, October 26, 2011 at 4:22pm.

What is an expanded algorithm? Son doesn't know and didn't bring home his textbook, any ideas?

- 4th grade math -
**Ms. Sue**, Wednesday, October 26, 2011 at 4:27pm
Check these sites.

http://www.atlantatraffic.com/KSUWebsite/?p=825

http://math-ed.com/NO/NO_2_4_reading.htm

- 4th grade math -
**TheQuestion**, Wednesday, October 26, 2011 at 6:08pm
Usually used with multiplication, creating an expanded algorithm is taking a formula and "drawing it out," or making it longer (and thus more simplified) by "un-distributing" it. For example:

Expand (a+b)n.

Answer: an + bn

Why: In the problem, n should be distributed to both a and b using the Distributive Property of Multiplication.

Example #2:

Expand (2+4+9)10.

Answer: 20+40+90, or 150

Why: See above.

Hope this helps!

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