This is a book on how to measure weight (which is technically mass). The books focuses on measuring the solid objects like a dog, apples, or candy. (This avoids having to subtract the mass of the container a liquid is held in). The book is nothing fancy or complicated. It has color photos and shows various things that you can measure. It does mention the metric scale and includes those measurements in parentheses.This book would be perfect for a math center in the classroom especially if you have a measuring station set up. You would need a few types of measuring devices including a balance scale, hanging scale (a hook form), a standing upon scale for the kids, and a regular digital scale. Plus you would need weights for the balance scale AND lots of things to weigh and compare weights.If representing a particular ethnicity is a concern at your school, the son and his grandpa light tan skin, black hair, black almond shaped eyes - I would say they appear to be Asian American (maybe Korean, Japanese, Chinese, etc.) Over the years, I have learned that many ethnicities in various countries can share similar physical features so this is only an estimation of ethnicity.Overall, we own all four books in the series. They are not overly engaging, but do address what needs to be learned. I would start with measuring distance, then liquids, then weight, and finally time. I do time last because the concept is just harder for the little ones to understand because you cannot see and experiment with it as much as the first three types of measurements.
