Dapatkan tips-tips yang mudah untuk belajar matematik.....anda pasti menyukai subjek matematik nanti...blog ini khas buat pelajar-pelajar kesayanganku....di harap dapat memberi manfaat kepada kalian semua...AMeeN....


Showing posts with label you tube. Show all posts
Showing posts with label you tube. Show all posts

Friday, 18 May 2012

How To Calculate in Fast Way



Only works if first digits are the same, and both last digits sum up 10
33 x 37 -> 3+7=10 (first digits = 3)
56 x 54 -> 6+4=10 (first digits = 5)
21 x 29 -> 1+9=10 (first digits = 2)
112 x 118 ->2+8=10 (first digits = 11)

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