Unit 4 Signs of Operation and Comparison
The following signs are made using two cells. The first cell is called a prefix (a prefix is generally made from a combination of dots 4, 5, and 6 since they are not used as letters).
These signs of operation and comparison are used with numbers just as they are written in print.
Signs of Operation
These signs of operation are formed using the dot 5 prefix and no space is left between the sign of operation and the numbers.
| Plus (+) | ⠐⠖ |
| Minus (-) | ⠐⠤ |
| Multiplication (x) | ⠐⠦ |
| Multiplication dot (∙) | ⠐⠲ |
| Divided by (÷) | ⠐⠌ |
Examples:
5+6
⠼⠑⠐⠖⠼⠋
10-2
⠼⠁⠚⠐⠤⠼⠃
100x52
⠼⠁⠚⠚⠐⠦⠼⠑⠃
7∙8
⠀⠼⠛⠐⠲⠼⠓
25÷5
⠼⠃⠑⠐⠌⠼⠑
Signs of Comparison
These signs of comparison are formed using either the dot 4 prefix (for < and >) or the dot 5 prefix (for =) and unlike the previous signs of operation, a blank space is left before and after the 2-cell symbol.
| Equals (=) | ⠐⠶ |
| Less than (<) | ⠈⠣ |
| Greater than (>) | ⠈⠜ |
Examples:
9=5+4
⠼⠊⠀⠐⠶⠀⠼⠑⠐⠖⠼⠙
24∙8=
⠼⠃⠙⠐⠲⠼⠓⠀⠐⠶
33÷3=11
⠼⠉⠉⠐⠌⠼⠉⠀⠐⠶⠀⠼⠁⠁
true or false 6x6<38
⠞⠗⠥⠑⠀⠕⠗⠀⠋⠁⠇⠎⠑⠀⠼⠋⠐⠦⠼⠋⠀⠈⠣⠀⠼⠉⠓
a+3>7
⠁⠐⠖⠼⠉⠀⠈⠜⠀⠼⠛
Tally Marks
| Tally Mark ( ||||| ) | ⠸ |
| Strikethrough | ⠒ |
A tally mark is represented by a vertical line (dots 4-5-6). Groups of tally marks are represented by 5 tally marks followed by a space, but can also be represented as 4 tally marks followed by a strikethrough (dots 2-5) and then a space forming a "five-bar gate".
Examples:
||||| |||
⠸⠸⠸⠸⠸⠀⠸⠸⠸
|||| |||| ||
⠸⠸⠸⠸⠒⠀⠸⠸⠸⠸⠒⠀⠸⠸