# 1.7 Geometry and Time

## Unit Goals

- Students reason with shapes and their attributes, partition shapes into equal pieces, and tell time to the hour and half hour.

### Section A Goals

- Build and draw shapes to possess defining attributes.
- Compose two-dimensional or three-dimensional shapes to create a composite shape.
- Describe attributes of two-dimensional and three-dimensional shapes.

### Section B Goals

- Partition circles and rectangles into two and four equal pieces and describe the pieces with words (halves and fourths).

### Section C Goals

- Tell and write time in hours and half-hours.

### Glossary Entries

**a fourth**One piece of a shape split into 4 pieces that are the same size.

A fourth, or a quarter, of the square is shaded.

**a half**One piece of a shape split into 2 pieces that are the same size.

A half

**category**A label that tells how objects in a group are alike.**data**Information 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.**difference**The result when one number is subtracted from another.**estimate**To find a value that is close to the correct value.

**fourths**The pieces created when a shape is split into 4 pieces that are the same size.

The circle is split into fourths, or quarters.

**greater than**63 is greater than 32.

63 > 32**half-past**This clock shows half-past 4 o’clock or 4:30.

**halves**The pieces created when a shape is split into 2 pieces that are the same size.

The circle is split into halves.

**length**The measure of how long an object is in same-size units with no gaps or overlaps.

Example: The length of this sneaker is 15 cubes long.

**less than**32 is less than 63.

32 < 63**o’clock**The clock shows 2 o’clock or 2:00.

**sum**The total when two or more numbers are added.**survey**A way to collect data using a group of people answering the same question.**teen number**A number with 1 ten and between 1 and 9 ones.

Example:

Fifteen is 1 ten and 5 ones.**two-digit number**