4th Grade Math Power Standards

Below is our 4th grade list of absolute 'need to knows' standards/concepts for math. Please continually practice these skills, (spiral review as we call it) because these are the basics that sometimes get forgotten!

**Prime & Composite Numbers**

**Prime Number:**A prime number is a whole number greater than 1, whose only two whole-number factors are 1 and itself. Trick: The 'i' in PRIME standards for 'itself'!

Examples of

**prime**numbers: 2, 3, 5, 7, 11, 13, 17, 23, 29.....

Composite Number: A whole number that can be divided evenly by numbers

*other than*1 or itself. Example: 9 can be divided evenly by 3 (as well as 1 and 9), so 9 is a composite number. But 7 cannot be divided evenly (except by 1 and 7), so is NOT a composite number (it is a prime number).

Examples of

**composite**numbers: 4, 6, 8, 9, 10, 12, 14, 15, 16, and 18. *

*Remember, not all composite numbers are even! Check out the red numbers, which are composite and also ODD!*

**Factors & Multiples**

**Factors:**Factors are numbers you can multiply together to get another number.

Example: The factors of 12 are 1, 2, 3, 4, 6, 12.

*Remember, if a number has*

**more than**2 factors, it is also a**composite**number! If a number**only**has 2 factors (1 and itself), it is a**prime**number!**Multiples:**A multiple of a number is that number multiplied by an integer (a number).

When you learned your times tables, you were learning

**multiples**. For examples, 2, 4, 6, 8, and 10 are the first five multiples of 2. To get these numbers, you multiplied 2 by 1, 2, 3, 4, and 5, which are integers.

Example: Multiples of 6:

6 x 1= 6

6 x 2 = 12

6 x 3 = 18

6 x 4 = 24

6 x 5 = 30

So the first five multiples of 6 are 6, 12, 18, 24, and 30.

**Place Value**

**Place Value:**In our decimal number system, the value of a digit depends on its place, or position, in the number. Each place has a value of

**10 times**the place to its right. A number in standard form is separated into groups of three digits using commas. Each of these groups is called a period.

**Multiplication & Division**

**Multiplication:**The basic idea of multiplication is repeated addition.

Example: 5 x 3 is the same as 5 added 3 times or 5 + 5 + 5 = 15

**Division:**Division is splitting into equal parts or groups.

Example: 12 ÷ 3 = 4 . There are 12 chocolates, and 3 friends want to share them, how do they divide the chocolates?

**Long Division:**

*Remember: Daddy (divide) , Mommy (multiply), Sister (subtraction), Brother (bring down), Rover (repeat*

**or**remainder) (DMSBR)