4th grade math
posted by Sandy on .
What is an expanded algorithm? Son doesn't know and didn't bring home his textbook, any ideas?

Check these sites.
http://www.atlantatraffic.com/KSUWebsite/?p=825
http://mathed.com/NO/NO_2_4_reading.htm 
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 "undistributing" 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! 
I can't understand a word.