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Describe the result of adding a large positive number and a smaller negative number - ✔✔result is
smaller positive number, same as ignoring the signs and subtracting smaller number
How do you convert a fraction into a decimal? - ✔✔Divide the top number by bottom number
What is the key step in order to add or subtract unlike fractions - ✔✔finding the lowest common
denominator
How do you divide one fraction by another - ✔✔Invert divisor (flip over the second fraction) and multiply
both numerators and denominators (top and bottom numbers)
How can you convert a decimal into a percent - ✔✔Multiply decimal by 100 and add % sign, or move
decimal TWO places to the RIGHT and add %
How do you convert a fraction to a percent - ✔✔Convert to decimal, move decimal two places to the
right, add %
How do you change a decimal to nearest equivalent fraction - ✔✔Multiply decimal by desired
denominator, result becomes numerator of fraction (try to get closest to whole number)
Two different ways a ratio can be expressed? - ✔✔1- as a fraction
2- placing a colon between the numbers (5:54)
3- using the word "to" between the numbers
What is a proportion? - ✔✔a statement of equality (=) between two or more ratios: 1/2 = 4/8, 45/90 =
x/100
,What is meant by the root of a number? - ✔✔A root is two or more equal smaller numbers that when
multiplied equal the specified number: the second (square) root of 9 is 3, the fifth root of 32 is 2
How do you find the square of a number? Give an example. - ✔✔multiply the number times itself- 4 X
4=16, 10 X 10= 100
What is a common method of making computations involving very large or very small numbers more
manageable? - ✔✔Convert the numbers into scientific notation by using powers of 10. (7,234,000=
7.234 X 10^6)
How is 100,000 expressed as a power of 10? - ✔✔10 to the fifth
what formula is used to find the area of a rectangle? - ✔✔A=L(length) X W(width)
Area of a triangle? - ✔✔1/2 X B (base) X H (height)
Define Pi - ✔✔A constant that expresses the relationship between circumference and diameter of a
circle, approximately 3.14159 (number of times the diameter goes into the circumference)
Describe a trapezoid - ✔✔A trapezoid is a closed, four-sided figure having two parallel sides and two
sides that are not parallel.
What is the formula for the area of a circle? - ✔✔A = Pi X Radius squared (radius is half diameter)
Define matter - ✔✔Any substance that occupies space and has mass
Name three states of matter - ✔✔Solid, Liquid, gas
Define kinetic energy - ✔✔the energy of motion
, Work is the product of what two factors? - ✔✔Force and distance moved (W = F X D)
What are the parts of a lever: - ✔✔A rigid bar and a pivot point called the fulcrum
A wheelbarrow is what class of lever? - ✔✔second class (first class: see-saw, third class: tweezers)
Are all three states of matter affected by thermal expansion? If so, which is affected most? - ✔✔All three
are affected, gases are affected the most
What is a British Thermal Unit? - ✔✔The amount of heat energy required to change the temperature of
1 pound of water 1 degree Fahrenheit
Three methods of heat transfer? - ✔✔Conduction, convection, radiation
What term defines the temperature at which all molecular activity stops? - ✔✔Absolute zero
Can liquids be compressed? - ✔✔No, liquids are generally considered incompressible
What are the units used to express hydraulic or pneumatic pressure - ✔✔Pounds per square inch (PSI)
Describe how pressure is transmitted when a force is applied to a confined liquid - ✔✔Pressure is
transmitted equally in all directions
What formula expresses the relationship between force, pressure, and area - ✔✔Force = Area X Pressure
(F over A I P)
What is the approximate speed of sound at sea level on a standard day? - ✔✔661 knots or 340 meters
per second