Adding decimals-

 

Use column addition to solve these

 

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

 

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How to add decimals using columns

Neatly write out the question taking care to line the columns up correctly,.
  Add   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 addition to the tenths column, remembering to carry any tens into the next column as 1 for each ten you have.

                                                     13.8 +
                                                      1.4
                                                   =   .2  
                                                      
1

  So 8 + 4 is 12, so you put 2 in the tenths column and carry the 10 into the units column as a little 1 (this is because there are 10 tenths in 1 whole one).

Apply your knowledge of addition to the units column, remembering to carry any tens into the next column as 1 for each ten you have.

                                                     13.8 +
                                                      1.4
                                                  =  5.2  
                                                      
1

  So 3 + 1 = 4 plus the 1 you have carried is 4 + 1 = 5, so you put 5 in the units column and there is nothing to carry into the tens column (this is because there are 10 units in one whole 10).

Apply your knowledge of addition to the tens column, remembering to carry any hundreds into the next column as 1 for each hundred you have.

                                                     13.8 +
                                                      1.4
                                                 =  15.2  
                                                      
1

  So 1 + 0 = 1 , so you put 1 in the tens column and there is nothing to carry into the hundreds column (this is because there are 10 tens in one whole 100).

 

Practice answering some more questions using your calculator.

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Yr 6 Maths
Summer term 

Block A
Lesson 4

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Adding decimals-