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حساب ذهني

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  • 2ث= .............................ُُُ...........س
    7200ث
  • 5ث = ..........................دق
    300ث
  • عشر 36
    360
  • عشر 450
    45
  • . 4/100
    0.04
  • ربع 0 6
    15
  • 1/5س
    12
  • 1/3س
    20دق
  • 9/1000
    0.009
  • 640:100
    6.40
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