teaching written calculations
DESCRIPTION
TEACHING WRITTEN CALCULATIONS. St. Augustine’s Catholic Primary. Introduction. Common approach – so the children don’t get confused Mainly start recording fromY1 onwards Stages relate to year groups but not all children at year group level - PowerPoint PPT PresentationTRANSCRIPT
Introduction
• Common approach – so the children don’t get confused
• Mainly start recording fromY1 onwards• Stages relate to year groups but not all
children at year group level• Cover all calculations today – am available
afterwards, or speak to class teacher• Presentation on school website
Stage 2 – Children use empty number lines starting with the
largest number and counting on
34+23 = 57
34 44 54 55 56 57
34 44 54 57
34 54 57
Have a go!!
How would you use a number line to demonstrate 28 + 54 =
Use the column method to calculate345 + 67 =
SUBTRACTIONStage 1 – Teachers demonstrate
number lines
13 – 5 = 8
0 1 2 3 4 5 6 7 8 9 1011 12 131415
Have a go!!
How would you use a number line to demonstrate 58 – 24 =
Use the short column method to calculate 654 – 482 =
MULTIPLICATION – Stage 1 and 2Children must understand that
multiplication is repeated addition
5x3 =5+5+5
0 5 10 15
Grid method for TU X TU
X 5 0 6
2 0 1 0 0 0 1 2 0
7 3 5 0 4 2
1 3 5 0 1 6 2
1 3 5 0
+ 1 6 2
1 5 1 2
1
Stages 5 and 6 – Short method
56 x 27 =Children approximate first:
60 x 30 = 1800
5 6
X 2 7
3 9 2 56x7
1 1 2 0 56x20
1 5 1 2
1
Have a go!!!
Use the grid method to calculate43 x 6
Try the short method
Calculate 56 x 43 using the grid method and short method
DIVISION – Stage 1 and 2 –Children understand that division
is repeated subtraction -4 groups of 3 in 12
12 3 = 4
0 1 2 3 4 5 6 7 8 9 10 11 12 13
Stage 3 – Children continue to use repeated addition on number lines
including remainders13 4 = 3 r 1
0 1 5 9 13
Stage 4 – Short division using chunking method72 3 = 24
3)72 - 30 10 x 42 - 30 10 x 12 - 6 2 x 6
6 2 x Answer = 24 0
Stages 5 and 6 – Children use larger multiples and numbers
864 24 = 36
24)864- 720 30 x
144 - 72 3 x 72 - 72 3 x Answer = 36 0
Other Year 6 methods
Please look at the leaflets/website. These are used if children are having difficulties with the chunking method