Let children unconsciously contact and learn mathematics in life, which can improve their interest in mathematics and help them understand the importance of mathematics in life. Teach children from the beginning of decomposition and combination, and express them in words while dividing. Be sure to say it with your mouth. The child who can speak out means that she really has it.
Addition and subtraction: remember large numbers in your mind, count down decimals, such as 6-3= remember 6 in your mind, count down to 3, 5, 4, 3, and then get the result of subtracting large numbers from 6-3=3 in your mind, count up decimals, such as 4+2= remember 4 in your mind, count up to 2, 5, 6, and then get the result of 4+2=6.
Addition and subtraction formula.
I. Addition formula
1, addend+addend = sum
2, and-one addend = another addend
Second, the subtraction formula
1, minuend-subtrahend = difference
2. Difference+Minus = Minus
3, the minuend-difference = reduction