The following unabridged reviews are made available under license from their respective rights holders and publishers. Reviews may be used for educational purposes consistent with the fair use doctrine in your jurisdiction, and may not be reproduced or repurposed without permission from the rights holders.

Note: This section may include reviews for related titles (e.g., same author, series, or related edition).

From Cooperative Children's Book Center (CCBC)

Each of the board books in this quartet feature the same three young children who demonstrate simple math concepts in real-life scenarios through the four seasons. In the spring, Mei plants a sunflower seed and then uses her body (toe, knees, waist, shoulders) to measure the growth of the sunflower in Up to My Knees! In Circle! Sphere!, Manny joins Olivia and Mei in the summer to introduce elementary geometric shapes as they blow bubbles in the backyard. What Will Fit? has Olivia exploring spatial reasoning by considering how different fruits and vegetables do (or don't) fill her basket at an autumn farmers' market. And when Mei and Olivia come inside on a cold winter day in The Last Marshmallow, they warm up with hot cocoa and figure out how to divide three marshmallows into equal shares. Olivia is Black, Mei is Asian and brown-skinned Manny is likely Latino; all are engaged, curious children exploring their everyday world through math. Each book concludes with a double-page spread for adults that includes more about the concept introduced in each volume and a practical "Try This!" section with tips on ways to extend the math exploration with children. (Ages 2-4)

CCBC Choices 2021 © Cooperative Children's Book Center, Univ. of Wisconsin - Madison, 2021. Used with permission.

From Publisher's Weekly

Starred review from October 19, 2020
When Olivia heads to the farmer's market, she has a goal: "I want to fill my basket./ What will fit just right?" A beet is too smallâ€""There's so much space around it that it rolls"â€"and the apple is, too. An eggplant "is not wide enough," and a zucchini isn't right, either: "When I turn it, it's too tall." Then a display of pumpkins catches her eye: "Yay! Just the right size." Lin's clear, simple language describing how Olivia solves the problem is amplified in her perceptive artwork, which cannily mixes painterly textures and captivating details (Olivia's pink polka-dotted socks; a green blanket spread with decorative corn) with graphical simplicity to show a small Black child as she ponders, puzzles, and experiments with placing different things in the basket. Includes a brief explanation of the importance of spatial sense, and three suggested learning activities to expand the book's impact. Publishing simultaneously: Circle! Sphere!, The Last Marshmallow, and Up to My Knees! Ages 5â€"up.

From School Library Journal

Starred review from October 1, 2020

PreS-K-At the Farmers' Market, Olivia wants to find an object that will fit perfectly into her small wicker basket. Some produce is too large, some is too small, some is too long. Olivia must use her budding spatial reasoning skills to find a fruit or veggie with a just-right fit. Most sentences have a simple construction. Illustrations have a sketchy quality, but their deliberately unpolished look adds to their appeal, like an heirloom tomato in a pile of genetically modified perfect red spheres. The page that introduces the Farmers' Market shows it bustling with shoppers. Subsequent illustrations focus only on Olivia and her veggies. Olivia is a young Black girl with natural hair and a brightly eye-catching pink hooded sweatshirt. Olivia has an expression of pleasant curiosity throughout the book. Even when facing complex problems, she doesn't get frustrated. Near the end, she concentrates on a large spread of veggies, which may prompt young readers to try and guess what will fit. The corn? The potato? The squash? Spoiler alert: It's a baby pumpkin that fits snugly in the basket. Back matter gives tips on how to help children learn and grow beyond the book. VERDICT Part of the "Storytelling Math" series, this perfect little book features a Black protagonist and gentle teaching of complex spatial skills and is recommended for all pre-K collections.-Chance Lee Joyner, Haverhill P.L., MA

Copyright 2020 School Library Journal, LLC Used with permission.

From Horn Book

July 1, 2020
In board book form, Lin accomplishes that most difficult of tasks: creating engaging, accessible, age-level-appropriate, not-too-fussily illustrated stories that also teach something. In this case it's math. Each entry homes in on a specific mathematical concept, while together providing a tour through the seasons -- and a slice-of-life portrait of three friends, Olivia, Mei, and Manny. In the springtime-set Knees, Mei observes measurement and comparison as she cultivates a sunflower. Circle! Sphere! proves the mind-stretching fact that the children's three different-shaped bubble wands produce the same-shaped bubble. Fit's setting is a fall farmers' market and illustrates Olivia's spatial sense (and taste in produce). Wintry Marshmallow touches on division, both mathematical (how to split three marshmallows between two girls...) and behavioral (...without ruining the friendship). The illustrations are signature Lin -- think The Ugly Vegetables (rev. 9/99) and the Ling and Ting books -- with bold, saturated hues; thick black outlines; judicious use of frames; eye-pleasingly tidy details; and nothing extraneous. Brief "Exploring the Math" notes and "Try This!" suggestions, addressed to adults and written by an early math expert, are appended. All together, these diminutive math storybooks add up to a whole lot of fun.

(Copyright 2020 by The Horn Book, Incorporated, Boston. All rights reserved.)