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 =