Symmetry is when one shape looks the same if you flip, slide, or turn it. It's in words and even letters. It's in both nature and man-made things. In fact, art, design, decoration, and architecture are full of it. This clear and concise book explains different types of symmetry and shows you how to make your own symmetrical masterpieces. Notes and glossary are included.

    . . until they take so long that the picnic is gone!

    And, it's true, many of them do. But Paul Erdos never followed the usual path. At the age of four, he could ask you when you were born and then calculate the number of seconds you had been alive in his head. But he didn't learn to butter his own bread until he turned twenty. Instead, he traveled around the world, from one mathematician to the next, collaborating on an astonishing number of publications. With a simple, lyrical text and richly layered illustrations, this is a beautiful introduction to the world of math and a fascinating look at the unique character traits that made "Uncle Paul" a great man.

    "How long is a second?""A second is a hiccup--the time it takes to kiss your mom, or jump a rope, or turn around."The newest book by acclaimed picture-book creators Hazel Hutchins and Kady McDonald Denton explains units of time in imaginative terms children can understand: A second lasts as long as a hiccup; a week is seven sleeps; and a year is the time it takes to grown into new shoes! Any parent who's been asked, "How long is a minute?" or any kid who's wondered, "What does 'an hour' mean?" will enjoy this smart, simple, and surprising book.

    Perfect Square is the perfect choice for teaching kids to think outside the box! This imaginative picture book is an excellent choice to share during homeschooling. Young readers will learn days of the week and colors of the rainbow, as well as emotional resilience.In brilliant, innovative collage artwork, Michael Hall illustrates how a happy square transforms itself after facing one challenge after another. Cut into pieces and poked full of holes? Time to become a burbling fountain! Torn into scraps? Grow into a garden! Day after day, the square reinvents itself, from simple and perfect to complex and perfect . . . and always happy. “A near perfect concept book . . . a book to revisit often, and with delight.”—The Horn Book“Pages are lusciously intense as we watch versatility trump geometry”—The Chicago Tribune

    Hop along to the Field and follow Lonely and Chalk Rabbit through a year as they try to cope with their fast expanding brood and handle a different seasonal challenge each month, from the cold of February to the wet of April and the heat of July.

    How many stars were in the sky? A million? A billion? Maybe the number was as big as infinity. I started to feel very, very small. How could I even think about something as big as infinity? Uma can't help feeling small when she peers up at the night sky. She begins to wonder about infinity. Is infinity a number that grows forever? Is it an endless racetrack? Could infinity be in an ice cream cone? Uma soon finds that the ways to think about this big idea may just be . . . infinite.

    At first they’re cute, but with every passing day, the penguins pile up—along with the family’s problems. Feeding, cleaning, and housing the penguins becomes a monumental task. They’re noisy and smelly, and they always hog the bathroom! And who on earth is sending these kwaking critters? In a large format, and with lots of opportunity for counting, 365 Penguins is sure to become a perennial wintertime favorite.

    Delighted with his new career opportunities--as a TV screen and a picture frame--he decides the more angles the better, until an accident teaches him a lesson. Includes special teaching section. Full color.

    During dessert, the other guests do not mind their manners, each one taking half of the remaining cake as it is passed around. By the time it reaches Ant, barely a crumb is left for her to share with the King! She promises to make up for it by baking another cake for the King, and not to be outdone, all the other animals in turn offer to make twice as many cakes as the next. By the time the hippo speaks up, he's to bake 256 peanut butter cakes! With McElligott's signature humor and gorgeous mixed-media art, the math concepts of halving and doubling have never been so much fun.

    The cat, Odds, refuses to budge until Ethan wins a game of probability. Without looking, Ethan must pick out a dime from his coin collection or two matching socks from his dresser, or do something else improbable. If he doesn't, Odds is there to stay, and Ethan has a 100% chance of missing his big soccer game.A very improbable story about a challenging math concept.

    Can you imagine that many of anything?The playful illustrations from New York Times–bestselling artist Isabel Greenberg and the friendly, straightforward voice of author Seth Fishman illuminate some of the biggest numbers in the universe—a hundred billion trillion stars—and the smallest—one unique and special YOU. Here is a book for story time, for science time, for math time, for bedtime, and all the times in between.Perfect for curious children, classrooms eager for STEM content, and readers who have devoured Ada Twist, Scientist and How Much Is a Million?

    They're balancing just fine, but then along comes a frog. Can they make room for one more friend on their teeter-totter? What about two? What about more? But then a big bird comes along and wants to play too. Better watch out!

    When a hungry nightingale threatens to eat him for breakfast unless he can measure her song, the inchworm calls on his craft and skill to creatively solve the dilemma.

    The Queen has everything, everything except a bed. The trouble is that no one in the Kingdom knows the answer to a very important question: How Big is a Bed? because beds at the time had not yet been invented. The Queen's birthday is only a few days away. How can they figure out what size the bed should be?