Year 5 and 6 Calculations Maths Information Session

1
Year 5 and 6 Calculations Maths Information
Session

• Welcome
• Multiplication (Grid Method)
• Subtraction (Column Number Line)
• Division (Bus Stop, Chunking and Number Line)
• Addition (Column)

2
Multiplication

• Grid Method
• Example
• 16 X 37.4

• 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

3
Multiplication

• Now its your turn
• 2083 X 76
• 9 X 6.34
• 43 X 62

4
Subtraction

• Column Subtraction
• Example
• 1326 718.4

• 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!

5
Subtraction

• Number Line
• Example
• 7005 537
• Ellie and Safaa will explain this method which is
  useful for money calculations

6
Subtraction

• Have a go at these using either of the methods
  you have been shown.
• 2008 523.8
• 2674 837.6
• 689 143
• 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!

7
Division

• Bus Stop
• Example
• 2137 7

8
Division

• Chunking
• Example
• 977 18

• 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

9
Division

• Number Line
• Example
• 170 14

10
Division

• Three examples for you (Think which of the
  methods you would use to solve them)
• 380 17
• 3788 6
• 6912 3

• 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

11
Addition

• Column Addition
• 4382 769
• 29.83 147.09
• 9679 14823