1. Chapter 2 Vocabulary

2. Area
The number of square units needed to fill up a region on a flat surface.

3. Bar graph
A set of rectangular bars that have height proportional to the number of data elements in each category.  Each bar stands for all of the elements in a single distinguishable category (such as “red”).  Usually all of the bars are the same width and separated from each other.  

4. Centimeter
A metric unit one hundredth of a meter in length.   

5. Expression
A mathematical phrase that combines numbers (1,2…) and/or variables (y,z,x…) using operations (+ - x ÷).
2 (6) + 5 = 17

6. Generic Rectangle
A type of diagram used to visualize multiplying expressions without algebra tiles.  Each expression to be multiplied forms a side length of the rectangle, and the product is the sum of the areas of the sections of the rectangle. 

7. Greatest Common Factor GCF
For integers, the greatest positive integer that is a common factor of two or more integers.
28= 1, 2, 4, 7, 14, 28
42= 1, 2, 3, 6, 7, 14, 21, 42
The GCF of 28 and 42 is 14

8. Histogram
A way to display data, much like a bar graph in that the height of the bars is proportional to the number of elements, but it displays ranges of data instead of specific measurements.

9. A unit of length equal to one twelfth of a foot.
Inch
A unit of length equal to one twelfth of a foot.

10. Length
The distance from one end of an object to the opposite end.

11. Operation
A mathematical process such as addition, subtraction, multiplication, division, raising to a power, or taking a root.

12. Perimeter
The distance around a figure on a flat surface.

13. Stem-and-leaf plot
A way of displaying data values that is made by arranging the data with the vertical “stem” consisting of the first digits of the data and the horizontal “leaves” that show the remaining digits. 

14. Yards, feet, inches, miles, meters, centimeters
Units of Measure
A standard quantity (such as a centimeter, second, square foot, or gallon) that is used to measure and describe an object.
Yards, feet, inches, miles, meters, centimeters

15. Venn Diagram
A type of diagram used to classify objects that is usually composed of two or more overlapping circles representing different condition.