Mathematics and English progression

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      • Mental Calculation
        • Steps

Step 1 Objective

Know by heart all addition and subtraction facts for each number to 20.

Examples of what pupils should know and be able to do

• FTM(P)Y123 p. 31 - Acrobat pdf document (20Kb)

• Number Game Example of pupils work - Acrobat pdf document (1.1Mb)

• Dice Totals example of pupils work - Acrobat pdf document (414Kb)

• Number pyramids question - Rtf (rich text format) document (100Kb)

Probing questions

Look at this number sentence:

+ = 19. What could the two missing numbers be? What else? Can you tell/show me all the pairs of numbers that make 19? How do you know you have got them all?

What is 13 - 8? What other subtractions make 5?

NOTE: The easiest way to establish whether a pupil knows all addition and subtraction facts to 20 is to look for evidence of rapid recall in a range of contexts.

What if pupils find this a barrier?

Ask pupils to find all the additions and subtractions with a given answer - up to about 20.

Encourage pupils to be systematic and to look for patterns.

Targeting Level 4 Lesson N1.8 Starter Activity. - Acrobat pdf document (60Kb)

Twenty Cards ITP - Zip file (463Kb) can be used to practise number pairs to 20.

Number facts ITP - Zip file (456Kb) can be used to help develop the idea of subtraction.

Difference ITP - Zip file (457Kb) can be used to help make links with number line work.

Different visual images may need to be used to help develop the links between addition and subtraction

Refer to Teaching mental calculation strategies to L5 page pp. 15-30- Acrobat pdf document (554Kb)