Mental Math with Tricks & Shortcuts: Multiplying by 9, 99, 999, 9999 and so on veebruar 18, 2012 korrutamine +0 peastarvutamine korrutamine peastarvutamine
Mental Math with Tricks & Shortcuts: Multiply Up to 20 X 20 in Head veebruar 18, 2012 korrutamine +0 peastarvutamine korrutamine peastarvutamine