Mathematics, Operations (+, -, x, /, etc.)

Grade 3- 5

### Objective

Students learn about factors.

### Directions

**Facts to Know**
The following samples help you learn more about factors, factor trees, and prime factors.

A factor is a number which divides exactly into another number. When one number divides evenly into another number, the divisor and the quotient are both factors of the dividend.

Sample A

The numbers 7 and 5 are factors of 35.

When two or more factors are multiplied, they form a product. For example, 7 x 9 = 63

The numbers 7 and 9 are factors of the product 63.

A prime factor is the product of 1 and itself.

A factor tree is a chart which illustrates the prime factors of a number.

**Sample B**
The prime factors of 48 are 2 and 3. (3 x 2 x 2 x 2 x 2 = 48)

The prime factors of 36 are 2 and 3. (2 x 2 x 3 x 3 = 36)

Sample C

You can use the chart on page 5 to find missing factors for this problems: 9 x ___ = 54

1.Run a finger across the row of 9's until you reach 54.

2.Run a finger up the column from 54 until you reach the 6.

3.Therefore 9 x 6 = 54. The missing factor is 6.

4.This is the same as solving this problem: 54 ÷ 9

### Resources

- pencils
- Missing Factos activity page