Learn all about subitizing within 20, numeral formation, making teen numbers, and counting on from 10 with Subitizing in the Forest ! Subitizing is an essential math skill for early learners that builds the foundation for future concepts such as adding, subtracting, and place value. Written by a primary school teacher, this book is geared towards children aged 5-7 years and includes a “how to” page with tips on how to help your child learn these skills with numbers 11-20 . Happy learning!