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Math Vocabulary: Weeks 3-4 (Lessons 5-12)
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Terms in this set (19)
decimal number
a number that has digits to the right of the decimal point
estimation
a technique that is used to check whether an answer is reasonable by rounding the numbers and doing the arithmetic mentally
point
an exact location in space
curve
an endless connection of mathematical points
line
a straight curve
ray
a half-line that begins at one point and continues without end on a straight path through another point
line segment
the portion of a line between two of its points
angle
the figure formed by two rays that have a common endpoint
vertex
the point where the rays of an angle intersect
right angle
an angle whose rays are perpendicular and whose measure is 90 degrees
acute angle
an angle whose measure is between 0 degrees and 90 degrees
straight angle
an angle whose measure is 180 degrees
obtuse
an angle whose measure is greater than 90 degrees and less than 180 degrees
perimeter
the distance around a flat, geometric figure
divisibility
the capability of a whole number to be divided by another whole number with no remainder
composite number
a whole number that has more factors than just itself and 1
prime number
a whole number that only has two factors, itself and 1
Rules for Divisibility
A whole number is divisible by:
2 if the last digit is 0, 2, 4, 6, 8
3 if the sum of its digits is divisible by 3
5 if its last digit is 5 or 0
10 if its last digit is 0
Dividing by powers of 10
When we divide a number by a power of 10, we move the decimal point to the LEFT. The number of places we move the decimal point equals the number of zeros in the power of 10.
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