How to memorize the addition formula table
The addition formula table needs to be memorized, so what are the memorizing skills of the addition formula table?
Addition: Remember large numbers in your mind and count decimals up, for example, 4+2= remember 4 in your mind, count up two numbers, 5 and 6, and then get the result of 4+2=6.
Subtraction: Remember large numbers in your mind and count down decimals, such as 6-3= Remember 6 in your mind and count down 5, 4 and 3 to get the result 6-3=3.
Parents need to cooperate with their baby to add and subtract within 30 kinds of 10 every day to improve their baby's arithmetic ability, and be careful not to let them count their fingers, so as to cultivate their baby's habits and mental arithmetic ability. You can also dial this number with the counter. Parents say the number and children dial the number. A composition that is said while dialing. For example, 12 consists of 1 tens and 2 ones.
How to teach children the formula of addition and subtraction
Addition and subtraction formulas can help calculate addition and subtraction, so how to teach children to add and subtract formulas?
Arithmetic is complicated, and it is difficult for children to accept it if they teach difficult arithmetic from the beginning. Parents can integrate life into their children's math study. For example, go to the supermarket to buy apples, let the children choose and count themselves. After returning home, parents can ask their children to wash two apples and ask them how many apples each has left after eating. In this way, letting children unconsciously contact and learn mathematics in life can improve their interest in mathematics and help them understand the importance of mathematics in life.
You can use decomposition skills to teach children from the beginning of decomposition and combination. At the same time, it can be expressed in words. You must say it with your mouth. The child who can speak out means that he has really mastered it. Start with less than 5. Let's talk about decomposition 2 first. Remember to put them together after each separation.
Quick oral calculation skills
Fast oral calculation needs constant practice, so what are the skills of fast oral calculation?
Mastering the arithmetic and algorithm of oral calculation is the premise and foundation of cultivating oral calculation ability. If the teacher only pays attention to the results of oral calculation and ignores the teaching of arithmetic, it will lead to the slow operation speed of students, and once the calculation habit is formed, it will have a serious impact on the improvement of oral calculation skills.
In primary school, we should master the arithmetic of carry addition, subtraction, multiplication and division within 20, multiplication and division within the table, and addition and subtraction within 100, which is the basis of all other operations. For example, when calculating 9+4, because 9+ 1 gets 10, 4 is divided into 1 and 3 (ten-point method), 13 plus 3. To simplify the thinking process, just divide 4 by 1 and add 9 to make it 10, and the rest is a dozen. It is impossible to learn math well without a solid foundation.
Shorthand method of addition formula
It takes time to write the addition formula, so what are the shorthand methods for the addition formula?
Remember large numbers in your mind and add and subtract decimals. Addition: Remember the large numbers in your mind and count the decimals up, for example, 4+2= remember 4 in your mind, count up two numbers, 5 and 6, and then get the result 4+2=6. Subtraction: Write down large numbers and decimals, such as 6-3= write down 6, count backwards to three, five, four and three, and then get the result of 6-3=3. Parents should cooperate with each other and add or subtract 10 within 30 kinds every day to improve children's arithmetic ability. Be careful not to let children count their fingers, form habits and cultivate mental arithmetic ability.
Let children know that 10 plus a few equals 10, for example:10+1=1? 10+2= 12 until 9. The second thing to remember is1+1= 2,2+2 = 4,3+3 = 6,4+4 = 8,5+5 =18.