Subtracting decimals-

 

Use column subtracttion to solve these

 

a) =
b) =
c) =
d) =
e) =

 

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How to subtract decimals using columns

Neatly write out the question taking care to line the columns up correctly,.
  Subtract   13.8 - 1.4  
  So your question should look something like this, 
remember it is best to put the decimal point in the answer space before doing your calculations

                                                     13.8 -
                                                      1.4
                                                   =   .   
                                                                                               

  - The neater the columns are the less likeley you are to  make any mistakes when adding the columns together.

Apply your knowledge of subtraction to the tenths column, remembering to borrow any units if you need them  from the next column to the left as 1 unit = 10 tenths.

                                                     13.8 -
                                                      1.4
                                                   =   .4  
                                                      

  So 8 - 4 is 4, so you put 4 in the tenths column.

Apply your knowledge of subtraction to the units column, remembering to borrow any tens if you need them from the next column to the left as 1 ten = 10 units.

                                                     13.8 -
                                                      1.4
                                                 =   2.4  
                                                      

  So 3 - 1 = 2, so you put 2 in the units column and then repeat the process to the tens column.

Apply your knowledge of subtraction to the tens column, remembering to borrow any hundreds if you need them from the next column to the left as 1 hundred = 10 tens.

                                                     13.8 -
                                                      1.4
                                                 =  12.4  
                                                     

  So 1 - 0 = 1 , so you put 1 in the tens column and the calculation is complete, as there are no more digits in the top line of the calculation.

Borrowing example- Apply your knowledge of subtraction to the columns, remembering to borrow. This shows a good way of setting out the borrowing from the next column to the left when subtracting.

                                            

 As 9 is greater than 8 you need to borrow a 1 from the units column, so you reduce the units column by 1 and place it next to the 8 which then becomes 18 tenths, which leaves you with 18 - 9 = 9. (NOTE 1 unit = 10 tenths)

 

Practice answering some more questions using your calculator.

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Yr 6 Maths
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Block A
Lesson 5

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