100 Things


This is an activity based on the picture book 100 Things

Achievement Objectives
NA1-2: Know the forward and backward counting sequences of whole numbers to 100.
NA1-3: Know groupings with five, within ten, and with ten.
Specific Learning Outcomes
  1. Students will be able to identify the sets within sets, especially the groups within 100 and within 10.
  2. Students will be able to use skip counting to count large sets.
Description of Mathematics
  1. One hundred is a multiple of several other whole numbers (equal groups within 100).
  2. Grouping and skip counting is an efficient way to count large sets and is an early form of multiplication.
Required Resource Materials

100 Things by Masayuki Sebe


Inventory of Things
This activity is based on the book: 100 Things

Author: Masayuki Sebe
Illustrator: Masayuki Sebe
Publisher: Gecko (2011)
ISBN: 978-1-877467-82-0

This book is a series of large double page spreads of colourful cartoon sets of 100 things. But each page has lots of variety and opportunities to explore grouping and sorting. There is also a connection between each double page spread that encourages the reader to move on to the next page. While each page presents 100 things, within each page there are opportunities to explore groups within 100 and within 10, and taken together there is also the opportunity across the pages to explore the concept of 1000 (10 groups of 100).

Lesson Sequence:

  1. Prior to reading, warm up with some 100s board skip counting (especially in multiples of 10) and some tens frames practice (How many more dots to make ten?). Ask students to estimate how many things are on the front cover. Does it look like more than 100 or less than 100?
  2. Share the book with your students. On the first day, move through the book stopping to check the count and organisation on a few pages. Each spread leads to the next through a connecting cartoon along the right hand edge of the page.
  3. Then you can re-visit the different pages over a week or more to highlight different ideas. Each double page spread represents 100 things organized in different ways. Some are 10 groups of 10 or 5 groups of 20 and clustered by colour or another characteristic. Some are presented in a long line with each 10 marked as you would on a number line. Within each set of 10 there are opportunities to look for the groupings, such as 3 with eyes open so 7 with eyes closed, or 9 facing right and 1 facing left.
  4. Explore the pages as a warm up each day or have coloured photocopies of pages for students to explore and record ideas as an independent activity.
  5. In response to the story create problems related to inventory counting.
    For example:
    How many counters do we have?
    Do we have 100 buttons in our class?
    How many unifix blocks do we have?
    How long will 100 unifix blocks be? How many 10s is in that?

    Take photos of the sets of 100 created by students.
  6. As an extension print 10 photos of 100 things and explore the set of 1000 as 10 groups of 100. Relate this to place value learning.

Other books:

There are several other similar books by the same author:

  • 100 People (ISBN 978-1877579868)
  • Lets count to 100 (ISBN 978-1554536610)
  • 100 animals on parade (ISBN 978-1554538713)

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