Today we will be learning to explain the methods and reasoning used to complete calculations.

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Objective: To be able to use mental methods of calculation.

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Presentation transcript:

Today we will be learning to explain the methods and reasoning used to complete calculations.

Mental Activity We are going to practise adding 3 one-digit numbers. Top Tips Look for pairs that add up to 10. Look for doubles and near doubles.

Main Activity Today we are going to learn to explain methods of calculation. Here is a calculation to complete. 64  2 = 32 Think about how you worked out the answer before we check to see if you were right.

Try these calculations. 28 x 2 = = = 15 What strategies did you use to help you to work out the answers quickly?

Can you explain your method of calculation for each of these? = = x 2 =  2 = =

Group Work Add 10 then subtract 1 from one- digit and two-digit numbers. Work out calculations involving three-digit numbers and describe your strategies. Add 9 and 11 to different numbers. Subtract 7 and 8 from different numbers.