**Definition:**

A divisor is a number that divides another number evenly without leaving a remainder. In other words, if you divide a number by its divisor, the result is a whole number.

**Example:**

Let's consider the number 12. The divisors of 12 are 1, 2, 3, 4, 6, and 12 because when 12 is divided by these numbers, the result is a whole number.

**Study Guide:**

**Identify the number:**Start by choosing a number for which you want to find the divisors. Let's use the number 20 as an example.**List the factors:**List all the possible factors of the number. Factors are the numbers that can be multiplied together to get the original number. For 20, the factors are 1, 2, 4, 5, 10, and 20.**Identify the divisors:**From the list of factors, identify the numbers that divide the original number without leaving a remainder. In this case, the divisors of 20 are 1, 2, 4, 5, 10, and 20.**Understanding divisibility rules:**It's also helpful to understand the rules for divisibility, such as the rules for dividing by 2, 3, 5, 9, and 10. These rules can make it easier to identify divisors.

Remember, a number always has at least two divisors: 1 and the number itself. The study guide can help you identify all the divisors of a given number.

Study GuideDecimals/Fractions Activity LessonOrdering Decimals & Fractions Activity LessonPercent Grids Activity LessonFraction & Percent Circles Worksheet/Answer key

Decimals/Fractions Worksheet/Answer key

Decimals/Fractions Worksheet/Answer key

Decimals/Fractions Worksheet/Answer keyDecimals/Fractions Worksheet/Answer keyPercent Grids Vocabulary/Answer keyDecimals/Fractions

Number and Operations (NCTM)

Understand numbers, ways of representing numbers, relationships among numbers, and number systems.

Develop understanding of fractions as parts of unit wholes, as parts of a collection, as locations on number lines, and as divisions of whole numbers.

Recognize and generate equivalent forms of commonly used fractions, decimals, and percents.

Algebra (NCTM)

Use mathematical models to represent and understand quantitative relationships.

Model problem situations with objects and use representations such as graphs, tables, and equations to draw conclusions.

Grade 4 Curriculum Focal Points (NCTM)

Number and Operations: Developing an understanding of decimals, including the connections between fractions and decimals

Students understand decimal notation as an extension of the base-ten system of writing whole numbers that is useful for representing more numbers, including numbers between 0 and 1, between 1 and 2, and so on. Students relate their understanding of fractions to reading and writing decimals that are greater than or less than 1, identifying equivalent decimals, comparing and ordering decimals, and estimating decimal or fractional amounts in problem solving. They connect equivalent fractions and decimals by comparing models to symbols and locating equivalent symbols on the number line.