The symbol ≤ means 'less than or equal to'. For example, 1 ≤ 2 means that 1 is smaller than 2 OR equal to 2. In this case 1 is smaller than 2. Knowing what the symbol ≤ means, which one of the following is not correct?

Tips:
Ascending (getting larger): smallest number to largest number
Descending (getting smaller): largest number to smallest number

Some symbols to know:
> Means ‘greater than’
< means ‘less than’
≥ means ‘greater than or equal to’
≤ means ‘less than or equal to’

Related test: 11 Plus (11+) Maths Practice Test: Compare and Order Numbers (Easy)