Year 3 and 4 Calculations Maths Information Session
• Welcome• Multiplication• Subtraction • Division• Addition
Multiplication
• Arrayse.g. 5 x 6
• Partitioninge.g. 5 x 13
Multiplication
• Grid MethodExample
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
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.
Subtraction
• Number LineExample
140 - 67 =
Subtraction• Column SubtractionExample
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!
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!
Division
• Grouping
e.g. 32 ÷ 5 =
Division
• Number LineExample
127 ÷ 4 =
• Alex over to you!
Division• ChunkingExample
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
Division
• Bus StopExample
127 ÷ 4 =
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
Addition
• Number Line Additione.g. 64 + 89 =
• Partitioning Addition
Addition
• Column Addition
e.g. 109 + 17 =
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