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Commutative Property of Addition

the order in which numbers are added does not change the sum- a+b=b+a

Compatible Numbers

Numbers that are close to the given numbers that make estimation or mental calculation easier

25+93+75=(25+75)+93

=100=93=193

25+93+75=(25+75)+93

=100=93=193

Associative Property of Addition

changing the groupings does not change the sum

17+(13+10)=(17+13)+10

17+(13+10)=(17+13)+10

Compensation

adjust one number to make computations easier by changing the other number

320-190

+10 +10

330-200=130

320-190

+10 +10

330-200=130

combined

joined together

greater than

When a number is larger than the other number. Example 65 > 56

less than

When a number is smaller than the other number. Example 107 < 215

ordering

to arrange numbers from least to greatest or greatest to least

odd number

A whole number ending with 1, 3, 5, 7, or 9 in the ones place.

even number

A whole number ending with 0, 2, 4, 6, or 8 in the ones place.

prime number

a number with only 2 factors....one and itself.

square number

a number that results from muliplyina another number by itself ex. 3 x 3 = 9

product

the number from multiplication

2 x 3 =6

2 x 3 =6

factor

one of two or more numbers that are multiplied to form a product

multiple

counting by numbers. Example: the multiples of 6 are: 6, 12, 18, 24......

composite number

A whole number greater than 1 that has more than 2 factors.