## 16 terms

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

changing the groupings does not change the sum
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

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

### 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.