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numeration and operations section

### operations

addend+addend=sum

sum-addend=difference

factorXfactor=product

dividend ÷ divisor = quotient

### GCF greatest common factor

the greatest number that will divide evenly into the two numbers list factors of each then chose the highest one

### LCM least common multiple

the least product that is a multiple of each of the counting numbers....factor each a build a product consisting of each factor the most number of times it appears as a factor in any one of the counting numbers in the set. e.g...24=2∗2∗2∗3 36=2∗2∗3∗3 so LCM (24,36) = 2∗2∗2∗3∗3 =72

### rational numbers

all numbers that can be written as positive or negative fractions ...rational numbers can be expressed as fractions, decimals, or percents

### percents

to make an equivalent decimal number slide decimal two places to the left and drop the percent sign e.g....75% = .75

### irrational square roots

irrational square roots do not have a number that they are evenly multiplied by...if given an irrational square root to estimate find the 2 numbers it falls between e.g. square root of 41 is between 6 and 7

### rational square roots

nonnegative number that multiplies by itself to get the number e.g...square root of 1=1, square root of 25 is 5