Subtraction - Notes from our Parents Meeting

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−  Key Stage 1

Reception

Counting backwards from 10
Use a number line to count
Number sentences are written horizontally:            5 − 2 = 3

Vocabulary
Take (away), leave
How many are left/left over?
How many have gone?
One less, two less,… ten less...
How many fewer is …. than…?
Difference between
Is the same as

Year 1

Use a number line to count on to find the difference between two numbers

 

 Sum  Answer
 
15-5 5 6 7 8 9 10 11 12 13 14 15 10

15 – 5         5  6  7   8   9  10  11  12  13  14  15                   10

Vocabulary - As for reception with
Subtract, minus
How much less is….
Equals, sign

Year 2

Use a number line to count on to find the difference between two numbers
Counting on in larger steps.

 

 

 

42-23

7 10 2

= 19

 

 

 

23 30 40 42  

Vocabulary - As for year 1 plus
One hundred less
Tens boundary

 

−  Key Stage 2

Year 3

Use a number line to count on to find the difference between two numbers
Counting on in larger steps
 

  5 10 50 25 = 90
   

 

 

125 – 35

35 40 50 100 125  

Vocabulary - As for Year 2 plus
Hundreds boundary

Year 4

Set out subtraction calculation in expanded form
Begin to start exchanging  (decomposition)

301  
-   45  
  256  

               300  +   0  +  1
                        -           40  + 5 
                          =            200  + 50  + 6 

In this calculation the 300 should be crossed out to make 200.  One hundred is moved to the tens column to give ten tens (write this above).  This should now be crossed through and one of the tens moved to the units column to make eleven units.  These new numbers should be written in full, smaller, above the original and one step should be taken at a time.

Vocabulary - As for Year 3 plus
Decrease
Inverse

Year 5

Standard method of decomposition (exchanging).  In this sum the process is the same as in Year 4 but now the number is represented as a whole, not split into its constituent parts.  The 3 hundreds are crossed out to leave 2 hundreds (use the word, don't call it 3 and 2).  A one is written before the 0 tens to show ten tens (the hundred we have moved).  This ten (tens) is now crossed out to leave nine (tens) and one ten is moved to the units where it is written before the final 0 to show ten units.  The sum is now easy.

3 0 0
               -   1 2 7
                   1 7 3

                  

Vocabulary -As for Year 4 plus
Units boundary
Tenths boundary

 

Year 6

 Standard method of decomposition (exchanging) extended to include decimals
(ensure that decimals points are lined up).  Process as in Year 5 with vocabulary suitably adjusted.

                                                 2 • 1 2
                                             -   1 • 3 4
                                                 0 • 7 8

 Vocabulary - As for Year 5