Number Naming Themed Math Worksheets | Aged 4-6 When combining numbers, you just need to put them together based on their units. From left to right, or from the biggest to smallest unit you name the number. In this example, in the TENS unit is a "2" so it is twenty, and in the ONES unit is a "4" so it is a four. Simply combine the two and you'll get the name "Twenty-Four"