Most children learn numbers and counting best when focused on one or two new numbers at a time. Continue to repeat and practice known numbers to build confidence while repeating recognition, writing, and counting of new number. Check out the Number Identification, Counting, and Writing worksheets for a no prep activity to focus on learning numbers 1-20.
When we write numbers we are utilizing multiple senses including kinesthetic and visual. By engaging multiple senses it increases our ability to learn and retain information . It is also a great way for young children to improve small motor skills.