Growing children-


Here is a chart of the growth in (cm) of four pupils.


previous height


in (x)


Work out for

  Amount of growth in cm 


  Average monthly growth in cm (to 1 d.p)

Who had the most


growth in cm (to 1 d.p)



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How to solve the growth problem

Find the row in the table that contains the information you will need,.
  Jack   142   148    11      
  So your calculation to find the amount of growth for
Jack should be the new height take away the previous height 148 - 142 = 6 so Jack has grown 6cm since the last time he was measured.

  Using the column method  8 subtract 2 = 6 and both the remaining columns are 0 so the answer is 6cm

  - The neater the columns are the less likeley you are to  make any mistakes when subtracting the columns from each other.

The average monthly growth is the amount he grew 6cm, divided by the number of months it took to grow that much 11 so your calculation is 6/11.


because  your answer is rounded to two decimal places you will need to put in three place holding  0's into the calculation, so you are then left with two decimal places after rounding. Not forgetting you will also need to put the decimal point into the answer area before you start the division.
Now 11 does not go into 6 so you place a 0 above the 6 and then divide 60 by 11 which is  5 remainder 5, the remainder is carried to the next column to the right

  Repeat this process until you have a digit above each 0, then you can round your answer to two decimal places.

The complete calculation should look like this 

 So the average monthly growth is 0.55 (to 2 d.p).

The most growth is simply all the pupils names with the largest amount of growth, this could be just one pupil or all of them, depending on how much they have grown.


Practice answering some more questions using your calculator.

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