減數技巧 - 活用Timeline (1-10)


之前已經試過用Timeline的技巧來計加數,今次試下用Timeline技巧來計減數先!做法一樣,不過加數向右走,減數向左走! 呢個concept一教就識,多啲練習好快就識得減數啦!

減數技巧 - 活用Timeline (1-10) - 下載

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