Number and Operations in Base Ten

Understand place value.

- 100 can be thought of as a bundle of ten tens — called a "hundred."
- The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine hundreds (and 0 tens and 0 ones).

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With this interactive applet students can develop their understanding of place value and the relative position and magnitude of numbers in the base-10 number system. Users drag given numbers to their position on a number line, zooming in and out to increase precision. They can select from six levels of difficulty (Tens, Hundreds, Thousands, Millions, Billions, Decimals) and from 1 to 3 dots. There are three modes: Explore, Practice, Test. | Activity, Interactive Media Grade Level: 1, 2, 3, 4, 5 | |

This collection of three lesson plans is designed to provide students with practice understanding place value (0 to 999), using standard and word form to represent numbers, and using expanded form to represent place value. Each lesson plan provides activities that will help build student understanding of the concepts and practice to help reinforce the skill. Thirteen resource sheets are included and can be used with these lessons or as independent activities. | Lesson Plans Grade Level: 2, 3 | |

This paper describes a research project carried out by nine teachers from diverse schools in Australia. The project explored the role of a commonly used teaching activity, referred to in this report as the Base Ten Game, in developing children’s understanding of our number system beginning with whole numbers and extending to decimals. The report includes a description of the game, two case studies, and results and implications for the classroom. An appendix includes strategies for managing the Base Ten Game. | Activity, Case Study, Game, Instructional Strategy, Reference Materials Grade Level: K, 1, 2, 3, 4, 5 Resource is part of a PD collection | |

This interactive Flash applet helps students develop number sense and basic number concepts. Players attempt to guess the wizard's number by clicking on dragons to get clues related to the digit sum, a more/less range comparison, rounding, how far it is to the next hundred, comparison of tens and units, the number of units, and parity. Clicking on the wizard opens a keypad on which to type the secret number. A version covering numbers 0-100 is cataloged separately. | Activity, Interactive Media Grade Level: 2, 3, 4, 5 |