5-digit number 五位數
Ten thousand 一萬
  Tens thousands place 萬位
  10 thousands are 10,000 十個一千等於一萬
   
Addition with four places 四位加法
Carry 1 for every 10 滿10進1
   
Subtraction within four places 四位減法
Take 1 from the tens column for 10 in the units place 在十位處借1,當10到個位處
   
Estimate answers 估計答案
Is the answer reasonable? 答案是否合理?
  Round down 截尾法/進位概念
 
Addition and subtraction of three numbers 三個數連加/減
Calculation 算式
  Estimate the answer before the calculation 在列式計算前先估計答案
  make 10 合十
Mixed operations of addition and substraction 加減混合計算
the most expensive 最貴
  the cheapest 最便宜
 
Measure 量度

Kilometre (km)

公里/千米
 

Metre (m)

  Centimetre (cm) 厘米
  Millimetre (mm) 毫米
  arm-span 臂距
 
Use suitable tools for measuring lengths, widths, heights and distances 用適當工具量度長度、寬度、高度和距離
Measuring tool 量度工具
  Metre ruler 米尺
  Tape measure 捲尺
  Trundle wheel 滾輪
  Centimetre ruler 厘米尺
  Single unit 單名數
 
  Multiplication 乘法
  Repeated addition of the same number 把一個數字重覆連加起來
  One time of two 2的一倍 (2 x 1)
  Carrying 進位
 
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