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Module 2-2 (pages 88-93)

EQ: How is mathematics helpful in search and rescue operations?

 

Positive:

Numbers that are greater than zero (can be fractions if they are in the set of real numbers – whole numbers if they are in the set of integers)      Example: +1, +2, +3, +4….

Negative:

Numbers that are less than zero (can be fractions if they are in the set of real numbers – whole numbers if they are in the set of integers)      Example: -1, -2, -3, -4…

Integer:

The set of positive, negative whole numbers and zero.   Example: -4,-3,-2,-1,0,+1,+2,+3,+4…

Inequality:

A mathematical sentence where one quantity is greater or less than another.  Inequalities use the symbols <, >, ≤, ≥

Opposite:

Two numbers that are the same distance from zero on a number line. Example: +4 and –4, -7 and +7

Absolute Value:

The distance from a number to zero on a number line (The positive value of any number.)  Example:

Plane:

A flat surface that goes on forever in all directions.  Example:

Intersect:

When two lines share at least one point, they intersect (cross)…remember lines continue on forever in both directions.

Perpendicular:

Two lines that intersect at 90° angles. (a corner)

Coordinate

Plane: A grid with a horizontal axis (x) and a vertical axis (y) that intersect at a point.

Origin:

The coordinates (0,0) on a coordinate plane.

Ordered Pair:

A pair of numbers indicating and (x, y) position.

Coordinate:
 

A number in an ordered pair, referring to either the x or the y position.