BOOKUU Easy Elementary Math Workbook for Ages 4+ focuses on addition and subtraction within 20, published by Beijing Education Press in 2016, Simplified Chinese.

This workbook, titled "BOOKUU Easy Elementary Math Skills - Addition and Subtraction Within 20 (Mental Arithmetic)", is designed for children ages 4 and up. Published by Beijing Education Press in March 2016, this Chinese version focuses on developing foundational math skills in mental arithmetic. Please note that this product is not a set and is written in Simplified Chinese.