| A | B |
|---|
| Acute angle | Any angle between 0 degrees and 90 degrees |
| Adjacent angles | Angles that have the same vertex and one side in common |
| Angle | Shape made by two straight lines coming together at a point |
| Architect's scale | A specialized ruler used in making or measuring reduced scale drawing |
| Area | The surface or amount of space occupied by two-dimensional object such as a rectangle, circle, or square |
| Bisect | To divide into equal parts |
| Borrow | To move numbers from one value column to anothervalue column to perform subtraction problems |
| Carry | To transfer an amount from one column to another column |
| Circle | A closed curved line around a central point |
| Circumference | The distance around the curved line that forms a circle |
| Convert | To change from one unit of expression to another |
| Cubic | Measurement found by multiplying a number by itself three times |
| Decimal | Part of a number represented by digits to the right of a point |
| Degree | A unit of measurement for angles |
| Denominator | The part of a fraction below the dividing line |
| Diagonal | Line drawn from one corner of a rectangle or square to the farthest opposite corner |
| Diameter | Length of a straight line that crosses fro one side of a circle, through the center point, to a point on the opposite side |
| Difference | The result you get when you subtract one number from another |
| Digit | Any of the numerical symbols 0 to 9 |
| Engineer's scale | Tool for measuring distances and transferring measurements at a fixed ration of length |
| English ruler | Instrument that measures English measurement |
| Equilateral triangle | A triangle that has three equal sides and three equal engles |
| Equivalent fractions | Fractions having different numerators and denominators, but equal values |
| Formula | Mathematical process used to solve a problem |
| Fraction | A number represented by a numerator and a denominator |
| Improper fraction | A fraction whose numerator is larger than its denominator |
| Invert | To reverse the order or position of numbers |
| Isosceles triangle | A triangle that has two equal sides and two equal angles |
| Machinist's rule | A ruler that is marked so that the inches are divided into 10 equal parts |
| Meter | The base unit of length in the metric system |
| Metric ruler | Instrument that measures metric lengths |
| Metric scale | A straightedge measuring device divided into 10 mm |
| Mixed number | Combination of a whole number with a fraction or decimal |
| Negative numbers | Numbers less than zero |
| Numerator | The part of the fraction above the dividing line |
| Obtuse angle | Any angle between 90 degrees and 180 degrees |
| Opposite angles | Two angles that are formed by two straight lines crossing |
| Percent | Of or out of one hundred |
| Perimeter | The distance around the outside of any closed shape |
| Pi | 3.14/Used to determine area and circumference of circles |
| Place value | Exact quantity of a digit determined by its place within the whole number |
| Positive numbers | Numbers greater than zero |
| Product | The answer to a multiplication problem |
| Quotient | The result of a division |
| Radius | The distance from a center point of a circle to any point on the curved line |
| Rectangle | Four-sided shape with four 90-degree angles |
| Remainder | The leftover amount in a division problem |
| Right angle | An angle that measures 90 degrees |
| Right triangle | A triangle that includes one 90-degree angle |
| Scalene triangle | A triangle with sides of unequal lengths |
| Square | A special type of rectangle with four equal sides |
| Standard ruler | An instrument that measures English lengths |
| Straight angle | A 180-degree angle or flat line |
| Sum | The total in an addition problem |
| Triangle | A closed shape that has three sides and three angles |
| Vertex | A point at which two or more lines come together |
| Volume | The amount of space occupied in three dimensions |
| Whole numbers | Complete units without fractions or decimals |
