1. Presentation of Written Calculation Methods
Ysgol Owen Jones
Presentation of Written Calculation Methods

2. Aims of Policy
To raise awareness in the methods used in school of written calculations
To illustrate the progression of calculation methods that children will meet.
To explore activities of reasoning and problem solving that children will meet.

3. Addition
Children encourage to visualise the number system through using Numicon, objects and number lines
8 + 5 = 13
Use of number lines – numbered and then blank 34+23=57

4. Year 3 – empty number lines with larger numbers
58+86 = 124
= = =122

5. Horizontal Partitioning
67+24=91
60+20 = = =91

6. Vertical Methods 76 76 76 + 47 + 47 + 47 ____ _____ _______
____ _____ _______
_____ ______
Decimal point is in line

7. Subtraction Early methods the same except counting backwards.
Decompositon 25 – 13 using Numicon or base 10
25 -16

8. Formal Subtraction
Decompostion
8 6
_________

9. Multiplication Practical activities grouping sets
Counting in 2s 5s 10s
Use of Numicon
Repeated addition on a number line
4 x 6 =
Model with arrays

10. Grid method Short multiplication TU x U 23 x 8 20 3 8 160 24 = 160 24
= 160 24
184

11. Long multiplication 560 60 16 ______ 2736 70 2 30 2100 60
560 60 16
______

12. Division Practically Repeated Division 72 3 3 ) 72 -30 10 42 10 - 30
) 72
- 30 6
Answer 24