Subtraction is the process of finding the difference between two numbers. It is the opposite of addition. When you subtract one number from another, you are finding out how much is left after taking away a certain amount.

In written form, subtraction is often represented using the minus sign (-). For example, the subtraction of 5 from 8 can be written as 8 - 5.

Here are some important facts to remember about subtraction:

- Subtraction is not commutative, which means that the order of the numbers matters. For example, 8 - 5 is not the same as 5 - 8.
- When subtracting a smaller number from a larger number, the result is always less than the original number.
- Subtraction is the inverse operation of addition, so it undoes the effects of addition. For example, if you add 5 to a number and then subtract 5 from the result, you will get back to the original number.

There are several strategies for performing subtraction, including:

- Counting Back: Start with the larger number and count back by the value of the smaller number.
- Using Number Line: Plot both numbers on a number line and find the distance between them.
- Regrouping: When the digit in the subtrahend is larger than the corresponding digit in the minuend, regroup to borrow from the next place value.

Now that you understand the basics of subtraction, it's time to practice! Here are some problems to try:

- 12 - 7 = ?
- 25 - 13 = ?
- 48 - 29 = ?

Remember to use the subtraction strategies we discussed to help you solve these problems!

Study GuideRational numbers and operations Worksheet/Answer key

Rational numbers and operations Worksheet/Answer key

Rational numbers and operations Worksheet/Answer key

Rational numbers and operations

Number and Operations (NCTM)

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

Work flexibly with fractions, decimals, and percents to solve problems.

Understand meanings of operations and how they relate to one another.

Understand the meaning and effects of arithmetic operations with fractions, decimals, and integers.

Compute fluently and make reasonable estimates.

Select appropriate methods and tools for computing with fractions and decimals from among mental computation, estimation, calculators or computers, and paper and pencil, depending on the situation, and apply the selected methods.

Develop and analyze algorithms for computing with fractions, decimals, and integers and develop fluency in their use.