Estimation

CONTENTS OF CURRICULUM UNIT 08.05.01

  1. Unit Guide
  1. Introduction
  2. Rationale
  3. Singapore Math
  4. Order of Magnitude
  5. Number Bonds
  6. Numbers to 20
  7. Numbers to 40
  8. The Number 100
  9. Classroom Activities
  10. Endnotes
  11. Bibliography
  12. Materials List

Each Number in its Place: Teaching Place Value to First Graders

Carol P. Boynton

Published September 2008

Tools for this Unit:

The Number 100

Tens and Ones

Students will now learn to count, read, and write whole numbers to 100. They will first be introduced to the tens, i.e. 50, 60, the number symbols and the number words. Then using countable items and number cards, students will be led to see that they can count in tens and ones and to write the corresponding number symbols. They should also be able to do the reverse, which is to tell how many tens and ones a given two-digit number is.

Estimation

Students will learn to estimate the quantity of an item within a container by comparing the proportion of the unknown quantity with a known quantity within another container of the same type. This method of estimation is useful for quantities that differ by about ten or in multiples of ten.

For students to arrive at reasonable estimates, they need to experience various scenarios requiring estimation, such as number of an item that can be held in containers of various sizes. This is to develop skills such as judgments of the size of the item and the container and making reasonable estimates.

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