Return to Playlist: Addition and Subtraction

Adding is a way of putting things together. Adding two amounts is calculated together as a larger amount. It is increasing in real life

As you can see, if you have 4 rabbits and you add 4 rabbits, you will have a total of 8 rabbits. You can write like this:

4 + 4 = 8 is a formula. You can read this: 4 and 4 are equal to 8. Formulas are basically mathematical sentences. Use numbers and symbols instead of words. To further write the equation, we use two symbols: + and =

The plus sign (+) means to add two things together. That's why we put it among the rabbits - we have 4 rabbits and 4 rabbits

Another symbol of our equation is equal sign (=). If equality is displayed in the equation, it means that the two are equal or equivalent. The same things do not necessarily look the same or look exactly the same, but they all have the same meaning

In mathematics, equal sign means that even if two numbers or expressions look different, they have the same meaning. Do you remember our rabbit? I have eight rabbits, so I wrote eight on the right side of the equal sign.

Please see how each side means 8? There are 8 rabbits on the left side and 8 rabbits on the right side. Both sides are equal

On the last page, I saw some formulas. An expression is useful because it helps track the amount you want to add.

Any additional questions can be converted into written expressions. For example, you intend to make three friends come to eat. At the end of the last two more invitations. To get the total number of friends going to your house, you can write such a representation:

Expressions are another way to explain the situation. Three friends and two friends eat it

Write these cases as mathematical formulas. Instead of solving the problem, just set it up

I found out how to write additional questions so let's solve some problems. When you are just beginning, it may be easier to use counting to solve this problem.

If this problem occurs, you can calculate the object to add. Some people like hand indexes in real life. Others use small objects like buttons and pennies. Other people may leave small marks on a piece of paper. When you learn to add, you can calculate! The more you practice, the easier it is to add without calculating it.

To use the number of objects, use an object to display each number in an expression. Let's try this equation, 2 +

Subtraction is the inverse of addition, so subtraction can be used to solve the subtraction problem. For addition to "restore", the corresponding subtraction is executed. The reverse is also true. This relationship makes it easy to assume that subtraction behavior resembles addition, but this assumption is incorrect, and this idea may cause many errors in arithmetic. If the algorithm uses a small number of strategies that apply to all situations, the algorithm is most efficient. Therefore, the algorithm does not use technology. For example, use almost twice. These techniques are effective in some cases, but they are not useful in most cases. The advantage of this algorithm is that it can be an automated process that, when understood, provides an accurate and efficient way to find a solution. Algorithms are reliable and effective tools in mathematics.

Understanding the addition and subtraction of integers is very important for further study of arithmetic and mathematics. Multiplication of integers can be thought of as iterative additions. Smooth relaxation is essential to the department. Use subtraction, especially when performing division using a divide algorithm. In the sense of measuring the size of a combination set, it may be completed as far as people calculate. The increase itself has not changed; even if you write 6, VI or 4, 2 + 6 it is 6. The history of addition and subtraction is mainly the history of the process people use to perform calculations, as the history of numbers is really about the development of numbers. Since the development of addition and subtraction is basically prehistoric, it is not documented. The oldest written mathematical record keeps going back to the ancient Egyptians and Babylonians over 4,000 years ago.