2.5 Numbers to 1,000
Unit Goals
- Students extend place value understanding to three-digit numbers.
Section A Goals
- Read, write, and represent three-digit numbers using base-ten numerals and expanded form.
- Use place value understanding to compose and decompose three-digit numbers.
Section B Goals
- Compare and order three-digit numbers using place value understanding and the relative position of numbers on a number line.
- Represent whole numbers up to 1,000 as lengths from 0 on a number line.
Glossary Entries
- bar graphA way to show how many in each group or category using the length of rectangles.
- centimeter
A length unit in the metric measurement system. There are 100 centimeters in a meter.
- composeTo make a new unit from 10 of the next smallest unit. For example, compose a ten from 10 ones.
- dataInformation about the things or people in a group.
Example: If you have a box of colored pencils, then the lengths and colors of each of the pencils are data about the pencils in the box. - decomposeTo break a unit into 10 of the next smallest unit. For example, decompose a ten into 10 ones.
- expanded form
A specific way of writing a number as a sum of hundreds, tens, and ones.
Expanded form writes a number as a sum of the value of each digit. Example: 482 written in expanded form is \(400 + 80 + 2\) .
- foot
A length unit in the U.S. customary measurement system.
There are 12 inches in a foot.
- inch
A length unit in the U.S. customary measurement system.
There are 12 inches in a foot.
- line plotA way to show how many of each measurement using an x for each measurement.
- meter
A length unit in the metric measurement system.
There are 100 centimeters in a meter.
- number line
A diagram that represents numbers as lengths from 0 using equally spaced tick marks or points.
- picture graphA way to show how many in each group or category using pictures of the objects or symbols.