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57 Cards in this Set

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  • Back
What are the place values to the billions starting at the decimal and moving left?
ones, tens, hundreds, thousands, ten thousands, hundred thousands, millions, ten millions, hundred millions, billions
What are the place values to the thousandths starting at the decimal?
tenths, hundredths, thousandths
What does > mean?
greater than
What does < mean?
less than
to order decimals you
compare the numbers from the left to the right
How do you add or subtract decimals?
1. Line up the decimal points
2. Add zeros if you need to.
3. Add or subtract the numbers.
What is an exponent?
The little number that tells how many times to use a base as a factor
What is a base?
The big number, in front of the exponent, that you use as a factor.
What is a product?
The answer in a multiplication problem.
How do you multiply decimals?
1. Don't worry about the decimals.
2. Multiply
3. Count how many decimal places there are to the right and put that many decimal places in your answer
What are the steps for dividing?
Divide, Multiply, Subtract, Compare, Bring Down
How do you divide with decimals in the divisor?
1. Change the divisor to a whole number by moving the decimal to the right.
2. Move the decimal in the dividend the same number of places.
3.Add zeros if you need to.
What is a fraction?
A number that names equal parts of a whole.
What is simplest form?
When the numerator and the denominator have no common factors and cannot be reduced anymore.
How do you add fraction with unlike denominators?
1. Change the denominators so they are the same by multiplying by magic ones
2. Add the numerators and place the sum over the denominators
What are the two ways you can reduce a fraction to simplest form?
1. Repeated Division
2. Create a factor tree and cross out the magic ones
How do you add fractions with common denominators?
Add the numerators and place the sum over the denominator.
What is a numerator?
The top number in a fraction.
What is a denominator?
The bottom number in a fraction
How do you add or subtract fractions with common denominators?
1. Subtract numerators and place the difference over the denominator.
2. Reduce
How do you subtract fraction with unlike denominators?
If needed, do the pinwheel, then:
1. Change the denominators so they are the same by multiplying by magic ones
2. Subtract the numerators and place the difference over the denominators
3. Reduce
How do you multiply fractions?
1.Multiply Across
2. Reduce
How do you divide fractions.
1. Do the windmill, if needed.
2. Keep the first fraction.
3. Flip the second fraction.
4. Multiply Across
5. Reduce
How do you convert fractions to decimals?
Drop and Divide
How do you convert decimals to percents?
Move the decimal two places to the right.
OR
Move the decimal 2 to the right
How do you convert percents to decimals?
Move the decimal two places to the left.
OR
Move the decimal 2 to the left
How do you convert a fraction to a percent?
1. Drop and Divide
2. Move the decimal 2 to the right.
What is the formula for finding the area of a triangle?
b x h ÷ 2
What is the formula for finding the area of a rectangle?
b x h
What is the formula for finding the area of a parallelogram?
b x h
How do you find the surface area of a rectangular prism?
1. Draw the surface area table.
2. Find the area of rectangle A, B and C.
3. Multiply the areas times 2.
4. Add them up.
What is the formula for finding the surface area of a rectangular prism?
(b x h x 2) + (b x h x 2) + (b x h x 2)
What is the formula for finding the volume of a rectangular prism?
b x w x h
What is the sum of the angles of a triangle?
180 degrees
What is the sum of the angles of a quadrilateral?
360 degrees
How do you find the perimeter of a figure?
You add up all the sides.
What is perimeter measuring?
The distance around a shape.
What is an acute angle?
An angle that is less than 90 degrees.
What is an obtuse angle?
An angle that is more than 90 degrees.
What is a right angle?
An angle that is exactly 90 degrees.
What is a straight angle?
An angle that is exactly 180 degrees.
How do you find the missing angle of a triangle?
1. Add the two angles that are given.
2. Subtract the sum from 180.
How do you find the missing angle of a quadrilateral?
1. Add the three angles that are given.
2. Subtract the sum from 360.
What does it mean when lines are parallel?
The do not intersect and will never intersect.
They are side by side like train tracks.
What does it mean when lines are perpendicular?
They make a 90 degree angle where they intersect.
Define "increase"
to become larger or greater
Define "decrease"
to become smaller in size or quantity
How do you round?
1. Circle the digit in the place you are rounding two.
2. Underline the digit to the right.
3. If the underlined digit is one through four, keep the circled number the same and turn the rest to zeros.
If the underlined digit is five through nine, increase the circled number by one and turn all the rest to zeros.
What is a mixed number?
A whole number and a fraction.
How to you change a mixed number to an improper fraction?
The "windmill" or "pinwheel"
1. Multiply the denominator by the whole number.
2. Add the product to the numerator.
3. Put the sum over the denominator.
How do you find the percent of a number?
1. Change the percent to a decimal.
2. Multiply
What is a prime number?
A number whose only factors are one and itself
What is a "factor"?
a number you multiply with another number to create a product
What is a mixed number?
A number made of a whole number and a fraction.
How do you find the mode?
1. Order the numbers from least to greatest.
2. The number that occurs most often is the mode.
How do you find the median?
1. Order the numbers from least to greatest.
2. Find the middle number.
3. If there are two, find the mean (average) of those two numbers.
How do you find the mean (average)?
1. Add all the numbers.
2. Divide the sum by the number of numbers.