mixed operations of addition and subtraction 加減混合計算 mixed operations of addition and subtraction (with brackets) 加減混合計算(包含括號)   mixed operations of multiplication and addition 乘和加混合計算   mixed operations of multiplication and subtraction 乘和減混合計算   perform multiplication and division before addition and subtraction 先乘除，後加減   mixed operations of multiplication and addition/subtraction (with brackets) 乘和加／減混合計算(包含括號)   amount paid 所付款項   amount to be paid 共付款項   amount still needed 尚欠款項   change 找回款項   amount saved 節省的款項 right angle 直角 acute angle 銳角   obtuse angle 鈍角   compare the sizes of angles intuitively 憑藉觀察比較角的大小   compare the sizes of angles using a transparency 利用透明膠片來比較角的大小   time line 時間數線   12-hour time system 12小時報時制   24-hour time system 24小時報時制   'duration of time' means the period of time 時段   'what time' means the point in time 時刻   'change the time systems' means change the times between the 12-hour and the 24-hour time 12小時報時制與24小時報時制互換 the properties of triangles 三角形的特性 3 sides and 3 angles 三條邊和三隻角   different kinds of triangles 不同種類的三角形       make different kinds of triangles on pin-boards 在釘板上圍出不同種類的三角形   draw different kinds of triangles 在方格紙上繪畫出不同種類的三角形   use triangles to make different shapes 用三角形拼砌出不同的圖形   divide shapes into triangles 把圖形分割成不同的三角形

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