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Published byTimothy Stevens Modified over 7 years ago

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Year 3 and 4 Calculations Maths Information Session Welcome Multiplication Subtraction Division Addition

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Multiplication Arrays e.g. 5 x 6 Partitioning e.g. 5 x 13

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Multiplication Grid Method Example 4 x 162 = Success Criteria Estimate Draw grid - what size? Partition each number Multiply the numbers Put on correct zeros Add vertical boxes in columns Check against estimate

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Multiplication Now its your turn 1.153 x 5 = 2.5 x 16 = 3.5 x 7 = Have a go at one or all three calculations using the methods the children showed you.

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Subtraction Number Line Example 140 - 67 =

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Subtraction Column Subtraction Example 143 - 69= Success Criteria Put digit in correct column Line up the decimal point Write the - sign Put the decimal point in answer box Copy numbers correctly Start at right Borrow from the left if you need to Watch out for the zeros!

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Subtraction Have a go at these using either of the methods you have been shown. 1.130 -77 = 2.145 - 68 = 3.46 – 34 = Success Criteria Put digit in correct column Line up the decimal point Write the - sign Put the decimal point in answer box Copy numbers correctly Start at right Borrow from the left if you need to Watch out for the zeros!

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Division Grouping e.g. 32 ÷ 5 =

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Division Number Line Example 127 ÷ 4 = Alex over to you!

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Division Chunking Example 127 ÷ 4 = Chunking Success! Work out multiples of the number you are dividing by e.g. 10x, 5x, 20x, 30x, Subtract the largest multiple possible Record in brackets which multiple you are subtracting Continue until the remainder is smaller than the number you are dividing by Add up how many multiples you have subtracted Record your answer e.g. 78 r 9

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Division Bus Stop Example 127 ÷ 4 =

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Division Three examples for you (Think which of the methods you would use to solve them) 1.134 ÷ 4 = 2.43 ÷ 6 = 3.691 ÷ 4 = Remember Chunking Success! Work out multiples of the number you are dividing by e.g. 10x, 5x, 20x, 30x, Subtract the largest multiple possible Record in brackets which multiple you are subtracting Continue until the remainder is smaller than the number you are dividing by Add up how many multiples you have subtracted Record your answer e.g. 78 r 9

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Addition Number Line Addition e.g. 64 + 89 = Partitioning Addition

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Addition Column Addition e.g. 109 + 17 =

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