basically, count how many they can get it right for these operations in 1 minute
actually the schools do have "mad minute" training from 2 to 4th
所有跟帖:
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比苦悶差多了,比中國的題海根本就是一滴水。
-大號螞蟻-
♂
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10/29/2012 postreply
20:01:43
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wow! crazy for 3-4 yrs old.
-quantnj-
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10/29/2012 postreply
20:25:48