Unit 2a: Number Sense

Unit 02: Number Sense

Key Vocabulary

This includes vocabulary that is new to this unit as well as vocabulary that was introduced in prior units.

• Real Numbers - can be represented on a number line.

• Irrational Numbers - A real number that can NOT be made by dividing two integers. Its decimal goes on forever, without repeating.

• Rational Numbers - A number that can be made by dividing two integers (an integer is a number with no fractional part).

• Integers - A number with no fractional part.

• Whole Numbers - There is no fractional or decimal part. And no negatives.

• Natural Numbers - The whole numbers from 1 upwards: 1, 2, 3, and so on ...

• Absolute Value - How far a number is from zero.

• Opposite - two numbers having the same numeral but different signs.

• Ratio - a comparison of two numbers by division. Ratios can be written three different ways.

• Rates - a special type of ratio that compares numbers that have different units. A rate could compare distance to time.

• Unit Rates - a special type of rate that compares two different units, but the second number of the comparison is the number one.

• Proportion - an equation that states that two ratios are equal. This is also thought of as equivalent ratios.

• Proportional tables - ratio tables are proportional when the Y values divided by the X values provide a constant rate of proportionality.

• Proportional graphs - plotted points are considered proportional when they are aligned in a straight line that passes through the origin.