Numbers we can multiply together to get another number.

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The result of multiplying a number by a whole number 

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The result of subtracting one number from another. How much one number differs from another.

Example: The difference between 8 and 3 is 5.

Always the same distance apart and never touching.

Here the red and blue line segments are parallel.

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At right angles (90°) to.

The symbol is ⊥

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When two or more parts are identical after a flip, slide or turn.

The simplest type of Symmetry is "Reflection" (or "Mirror") Symmetry, as shown in this picture of the dog.

The distance around a two-dimensional shape.

Example: the perimeter of this rectangle is 3+7+3+7 = 20

The size of a surface.

The amount of space inside the boundary of a flat (2-dimensional) object such as a triangle or circle, or surface of a solid (3-dimensional) object.

These shapes all have the same area of 9:

the digit to the right of the decimal point.  This picture shows 0.1 or one tenth.  

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the digit two places to the right of the decimal point.  This shows 0.27 or twenty-seven hundredths.

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a tool used to measure the degrees in an angle.

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a six-sided

 figure

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