Can teach me how to learn the multiplication, division, addition and subtraction of the positive and negative numbers in grade one, I am very poor in mathematics now, even the mathematics teacher asked me to find the teacher to make up for it

Can teach me how to learn the multiplication, division, addition and subtraction of the positive and negative numbers in grade one, I am very poor in mathematics now, even the mathematics teacher asked me to find the teacher to make up for it

Well
As long as you remember that positive gets positive, positive gets negative, negative gets positive. Addition, subtraction, multiplication and division are applicable
As for how to remember, it's up to you
For example, a positive 5 + (- 7) and a negative 5 + (- 7) is regarded as a negative 5-7 = - 2
If 64 - (- 57) two negatives are regarded as positive, then 64 + 57 = 121
-45-（-55）=-45+55=55-45=10
Multiplication and division are the same. A negative 6 * (- 8) is - 48
(- 6) * (- 8) two negatives become (-) * (- 6 * 8 = 48
Division is the same as multiplication 48 / (- 8) = - 6
（-48）/8=-6
（-48）/（-8）=6
Do you understand
If you don't understand, you can ask me