Khan Academy Arithmetic Terms
|How do you add/subtract decimal numbers?||Line up the decimals, then add/subtract as normal.|
|How do you multiply decimal numbers?||Multiply as normal, then count the number of spaces before each decimal in the problem; add to the answer.|
|Improper fraction||A fraction where the numerator is bigger than the denominator.|
|How do you divide decimal numbers?|| On the left side of the division problem, move the decimal over to the right (counting the number of spaces). |
Then, on the right side of the division problem, move the decimal the same number of spaces to the right; add decimal to the answer.
|Greatest common divisor (greatest common factor)||The largest integer that divides a set of integers without a remainder.|
|What are the 3 rules to finding the greatest common divisor?|| 1) Divisor cannot be larger than the difference of the two numbers.|
2) Divisor cannot be larger than the smallest number.
3) Divisor must be a factor of the difference, or else the smallest number (whichever is smaller)
|Least common multiple||The smallest multiple that is exactly divisible by every member of a set of numbers.|
|How do you find the least common multiple (elegant method)?||Find the greatest common divisor of the set of numbers, then multiply both integers with one another; divide your answer by the greatest common divisor to get the least common multiple.|
|Mixed number||A number that has both a whole number and a fraction.|
|How do you convert a mixed number into an improper fraction?||Multiply the denominator by the whole number, then add the answer to the numerator. Write resulting number over the denominator in the form of a fraction.|
|How do you convert an improper fraction to a mixed number?||Divide the numerator by the denominator, and apply answer to the mixed number.|
|Prime number||A natural number (1,2,3...) divisible by exactly two natural numbers: one and itself.|