# 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 of the rectangle is shaded.

• 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