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ADDITION AND SUBTRACTION

This workbook revises simple addition and subtraction and introduces more advanced questions.

Horizontal Addition Practice

Your child may still be using their fingers to calculate the answer to number sentences such as 18 + 2 = 20.  At this stage you can encourage your child to use other strategies to calculate answers such as remembering the large number  (18) and counting on using the small number (+2).  You can also explain to your child that when adding they can swap the position of the numbers to calculate the answer faster e.g. 6 + 4 is the same as 4 + 6.

Vertical addition practice

The vertical addition questions focus on the importance of number place value i.e. ones lined up below ones (units), tens underneath tens and hundreds underneath hundreds and so on.  Completing these units gives your child practice at the more advanced step of maintaining number place value while ‘carrying over’, for example

  •   3  8         Always start from the ones (far right hand side), 8 + 2 = 10
  • +    2        ” 0 ” goes under the ones and ” 1 ” goes on the top of tens  ” 3 ”  so 1 + 3 =4
  •   4  0        so the answer is 40

Vertical subtraction practice

The questions in these units also focus on number place value.  They provide practice in taking from the next number in order to calculate the answers to subtraction sums that contain multiple  ” 0 ”  s.

  •    1 0 0 0          When the top number is smaller than the bottom number by place value, each
  • –    2  7 9           place has to take from one higher place value than its own value.
  •      7   2 1           Working from right to left when 1 is right to left when 1 is taken from                                             the next higher value column it has a value of 10
  • Ones (units)  :  take from the tens
  • Tens  :  take from the hundreds
  • Hundreds  :  take from the thousands

How this works

  • Ones : 10 – 9 = 1
  • Tens : 9 – 7 = 2 (10 taken from hundreds but 1 given to ones)
  • Hundreds : 9 – 2 = 7 (10 taken from thousands but 1 given to tens)
  • Thousands : 1 taken so nothing is left in this place value
  • When all individual sums are positioned underneath their place value the answer is 721

Daily practice will help your child:

  • to hold number in their short term memory
  • to learn the skill of counting on from numbers greater than 10
  • 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

  • 80 units of two to multiple digit horizontal and vertical addition and subtraction practice
  • Answers to each unit
  • Suitable for 7 to 12 year olds

Addition and Subtraction Workbook = $12.00 AUD

 

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