Missing Factors

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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

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