Transcript Calculation Policy - Y5 & Y6

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)
Multiplication
• Grid Method
Example
16 X 37.4 =
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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
Multiplication
• Now its your turn
1. 2083 X 76 =
2. 9 X 6.34 =
3. 43 X 62 =
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!
Subtraction
• Number Line
Example
7005 – 537 =
• Ellie and Safaa will explain this method
which is useful for money calculations
Subtraction
•
Have a go at these using either of the methods you have
been shown.
1.
2.
3.
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!
Division
• Bus Stop
Example
2137 ÷ 7
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
r9
Division
• Number Line
Example
170 ÷ 14 =
Division
•
Three examples for you
(Think which of the
methods you would use to
solve them)
1.
2.
3.
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
r9
Addition
• Column Addition
1. 4382 + 769 =
2. 29.83 + 147.09 =
3. 9679 + 14823 =