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1+1=5: and Other Unlikely Additions Hardcover – September 7, 2010


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Product Details

  • Age Range: 5 and up
  • Grade Level: Kindergarten and up
  • Hardcover: 32 pages
  • Publisher: Sterling (September 7, 2010)
  • Language: English
  • ISBN-10: 1402759959
  • ISBN-13: 978-1402759956
  • Product Dimensions: 10 x 10 x 8 inches
  • Shipping Weight: 14.1 ounces (View shipping rates and policies)
  • Average Customer Review: 4.6 out of 5 stars  See all reviews (10 customer reviews)
  • Amazon Best Sellers Rank: #467,856 in Books (See Top 100 in Books)

Editorial Reviews

From School Library Journal

K-Gr 2–This clever concept book asks children to take a fresh look at simple addition. Are there times when one plus one can equal three and not two? Yes–if you add one unicorn and one goat, you get three horns. Can one plus one ever equal five? Yes, because when you add one set of triplets and one set of twins, you get five babies. After sharing the numerous examples provided, children can be asked to stretch their imaginations and come up with their own quirky equations. Sexton's brightly colored digitally rendered cartoonlike illustrations are not only cheerful and attractive, but they also provide subtle clues. For example, in the one plus one equals three problem, the unicorn and the goat are seated in the library, one reading a book on mythical beasts, one reading a book on barnyard buddies. The horns are obscured by the equation itself, and are then revealed on the next page. Observant children will enjoy playing detective. The book can be read independently but would also be fun to share with a group. A great way to encourage outside-the-box thinking.Grace Oliff, Ann Blanche Smith School, Hillsdale, NJ
© Copyright 2010. Library Journals LLC, a wholly owned subsidiary of Media Source, Inc. No redistribution permitted.

From Booklist

Starting with the title, this lively picture book offers fun math puzzles. Questions on each right-hand page present the puzzles with clues, while the answers appear with a turn of the page. How can 1 + 1 = 7? Flip the page and discover that 1 triangle and 1 square equals 7 sides. The bright, clear digital artwork illustrates the answers so that kids can easily count along. This is not for the youngest children, and it may confuse beginners just learning to count. But for students with a grasp of basic math, this provides lots of enjoyable exercises. They might start with easier examples, such as 1 + 1 = 10 (1 left foot + 1 right foot = 10 toes) before moving on to the more difficult physics: 1 + 1 = 1 (1 a.m. + 1 p.m. = 1 day). Some spreads touch on biology facts, too: 1 ant + 1 spider = 14 legs. And sports: 1 basketball team + 1 hockey team = 11 players. As in Stuart Murphy’s MathStart books, the engaging situations will make kids count and think. Grades K-3. --Hazel Rochman

More About the Author

David LaRochelle has been writing and illustrating books since 1988. His books have won numerous awards, including the Sid Fleischman Humor Award, the SCBWI Golden Kite Honor Award, and the Minnesota Book Award.

A former elementary school teacher, David enjoys solving puzzles, playing board games, and carving creative pumpkins, which you can view at his website www.davidlarochelle.com .

Customer Reviews

4.6 out of 5 stars
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I thought it was imaginative and very cleverly illustrated.
Lois M
As a math tutor I loved how it used lower grade level skills and set up some situations children will see more of in upper grades.
HanakoGal
We love reading this book (my 3 & 5 year olds) and then coming up with our own crazy equations.
SanFrancisco

Most Helpful Customer Reviews

6 of 6 people found the following review helpful By Lisa Barker on August 12, 2010
Format: Hardcover
Absolutely unique and a hit with my finicky second grade reader (he's very suspicious of picture books; they can be too babyish). At first he snorted with disdain. 1+1=5?? But the title and cover intrigued him and he started to read. Then he got hooked. He says it's very, very, very, very good! I say it's very clever and fun and a perfectly fresh idea that's a welcome read.
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4 of 4 people found the following review helpful By Lois M on October 29, 2010
Format: Hardcover Verified Purchase
I bought this book for a nine-year old greatgrandson. I thought it was imaginative and very cleverly illustrated. It will help make him umnderstand that things are not always as they seem.
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3 of 3 people found the following review helpful By Travis Ann Sherman VINE VOICE on February 17, 2011
Format: Hardcover
A quirky, funny and gorgeously illustrated treatment of --surprise!-- set theory! 1 + 1 = 5?!! Everyone knows it's two, that's dumb! But on the first page we see a bright illustration of two cheerful animals reading in a library (one is reading a book on mythical beasts and the other on barnyard buddies, hint, hint.) Turn the page and we see that 1 unicorn + 1 goat = 3 horns! And so it goes, each example partly a surprise, partly a joke, always a guessing game, and a fantastically fun and subtle intro into the concept of sets. A great addition (ha ha) to my library collection of fun math picture books.
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1 of 1 people found the following review helpful By voguewinegirl on January 17, 2014
Format: Hardcover Verified Purchase
Bought this book for a friend's children for Christmas after attending an award luncheon for the author. The book is creative and gets children thinking outside the box--using imagination and making basic math a fun and creative process. The child recipients of the book LOVED it! And so, child-tested, I give it a 5 star rating.
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1 of 1 people found the following review helpful By E. Kennen on November 14, 2011
Format: Hardcover
How could 1 + 1 = 13? When it involves one octopus, one starfish, and 13 arms! This is a clever and original picture book, which gives a hidden math lesson in a whimsical and entertaining way. If kids can count, they can understand this book; yet, it also works for elementary-aged kids, who can use their knowledge of the world and math skills to try to figure out how two different sets of things could equal 5 or 110... or even 0. I strongly recommend this book -- it is pure fun and quirky mind-stretching all in one.
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