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SUBTRACTION 2

Subtraction 2 begins with revision of subtraction in the number sentence format.  It then introduces the vertical format used for subtraction of numbers with two to four digits.  The importance of the concept of number place value is reinforced ie. that numbers increase in value from right to left and must be vertically aligned as follows:

Place values

  • Thousands / Hundreds / Tens / Ones
  •                              6                   5           9    
  •                 –           1                   7           9

Subtraction 2 also provides practise in taking from the next higher place value column to calculate answers where the top digit is smaller than the bottom digit, e.g.

  • Ones : 9 – 9 = 0
  • Tens : 5 is smaller than 7 so to calculate the answer 1 must be taken from the tens column.  The 5 then becomes 15 so the sum is now 15 – 7 = 8
  • Hundreds : 6 has given 1 to the tens column so now there is only 5 left  so the sum is 5 – 1 = 4
  • When the individual digits are positioned in the correct place value the answer is 480

Daily practise will help your child:

  • to learn that subtraction of numbers with two or more digits must be carried out from right to left
  • to learn that numbers must be correctly aligned in order to calculate the correct answer
  • to understand the importance of number place value

Summary of Contents

  • Subtraction practise
  • Units 4.1 to 4.39 – ones from tens
  • Units 4.40 to 4.61 – tens from tens
  • Units 4.62 to 4.71 – tens from hundreds
  • Units 4.72 to 4.75 – hundreds from hundres
  • Units 4.76 to 4.80 – thousands from thousands
  • 80 units of 2 to 20 questions
  • Answers to each unit
  • suitable for 6 to 12 year olds

Subtraction 2 Workbook = $12.00 AUD

 

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