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These are about as hard as you will get for mental arithmetic. Many children (and adults) will find them very tricky!

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Tricky sums, these. Think about the digits in the tenths and hundredths columns when working out these addition of decimals questions.

Work out mentally the answers to these sets of addition sums. For some, write down the method used to do it.

Using the standard written method to add thousands. All questions should be answered in this way. Take particular care that the units are lined up when adding these totals together.

Mental addition skills with numbers up to 3 decimal places.

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