Continuing from the previous post......
What other patterns can you derive from (a), (f), and (g)?
a) 99 x 37
f) 99 x 55
g) 99 x 19
Did you see any pattern?
Well, the pattern that I see is, when 99 multiply a number that both digits add up to 10, (e.g., 99 x 19, 99 x 28, 99 x 73, 99 x 64), it will produce a symmetrical number, eg. 1881, 2772, 7227, 6336. Having this in mind, I hope it can speed up your mental calcuation.
Have fun
2008年10月9日星期四
订阅：
博文评论 (Atom)
WebQuest
What is a WebQuest?
A WebQuest is an inquiry-oriented activity in which some or all of the information that learners interact with comes form resources on the Internet, optionally supplemented with videoconferencing.
-Bernie Dodge
Source: http://webquest.sdsu.edu/about_webquests.html
没有评论:
发表评论