Adding and Subtracting Decimals - instruction and practice

The PowerPoints are designed to help introduce or revise the technique of adding and subtracting numbers with decimal places, using money (£ and p) as the main context.
They each include an instructional section followed by a number of examples.
The level of difficulty gradually increases.
There are further examples towards the end, showing that the same technique works for numbers and measures.
The ‘golden rule’ of aligning the decimal points is stressed and illustrated.

In addition, there are four worksheets for each operation:
Number 1 is the simplest and includes a detailed ‘instructional’ preamble;
Number 2 has a less detailed preamble followed by the same questions as number 1 plus another 10;
Number 3 increases the skill level - to adding three numbers for addition and to working with 2 decimal places for subtraction - and includes questions in the context of pounds and pence;
Number 4 deals with numbers that have different numbers of decimal places.
There is an answer sheet for each set.

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