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Marshfields School

A Positive Choice

Calculation Methods

Marshfields Maths Page

Addition methods, Have a go!

  1.  Using a number line is the first step after using cubes to add smaller number less than 25.
  2. This is an example which does NOT cross the tens boundary and is an important step to understand and be secure with the method of using columns.
  3. Once children can add a multiple of ten to a 2-digit number mentally (e.g. 80+11), they are ready for adding pairs of 2-digit numbers that DO cross the tens boundary (e.g. 58 + 43)
  4. In order to carry out this method of addition:
  • Children need to recognise the value of the hundreds, tens and units without recording the partitioning.
  • Pupils need to be able to add in columns.
  • Start with adding the units, in preparation for the compact method.
  1. When children are secure with this method move on to the short hand version of compact column addition.
  2. Decimals work in the same way - remember to use the right unit of measure, e.g. money has a £ sign in the answer.

 Subtraction Methods (Take Away!)

  • Use number lines.
    Count from the smallest numbet to the biggest number to find the difference.

  • Expanded subtraction for demonstrating decompostion.

Have a great summer
and try to think about how many times each day
you use some kind of mathematics ….. you’ll be surprised!