Subtraction is the mathematical operation of taking away one number from another. It is the opposite of addition. When you subtract, you are finding the difference between two numbers.

For example, if you have 5 apples and you eat 3 of them, you can use subtraction to find out how many apples you have left. The equation would be 5 - 3 = 2, so you have 2 apples left.

Subtraction is typically represented using the minus sign (-). The number that is being subtracted is called the subtrahend, and the number it is being subtracted from is called the minuend. The result of a subtraction is called the difference.

When performing subtraction, it's important to remember that the order of the numbers matters. For example, 5 - 3 is not the same as 3 - 5. The result will be different depending on the order of the numbers.

Subtraction can be represented visually using number lines, counting backwards, or using objects to physically take away from a group. It is an important skill in mathematics and is used in various real-life situations.

Study GuideRegrouping Worksheet/Answer key

Regrouping Worksheet/Answer key

Regrouping Worksheet/Answer key

Regrouping

Number and Operations (NCTM)

Compute fluently and make reasonable estimates.

Develop fluency in adding, subtracting, multiplying, and dividing whole numbers.

Select appropriate methods and tools for computing with whole numbers from among mental computation, estimation, calculators, and paper and pencil according to the context and nature of the computation and use the selected method or tools.

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.

Connections to the Grade 3 Focal Points (NCTM)

Number and Operations: Building on their work in grade 2, students extend their understanding of place value to numbers up to 10,000 in various contexts. Students also apply this understanding to the task of representing numbers in different equivalent forms (e.g., expanded notation). They develop their understanding of numbers by building their facility with mental computation (addition and subtraction in special cases, such as 2,500 + 6,000 and 9,000 - 5,000), by using computational estimation, and by performing paper-and-pencil computations.