1, single digit subtraction formula, subtraction difference is zero, leaving the last digit. For example, 5 minus 5 equals 0, so the last digit is 0. From small to large, the final ranking remains unchanged. For example, 7 minus 4 equals 3, and the last digit is 3. Subtraction does not abdicate, but subtracts one by borrowing. For example, 8 minus 5 equals 3, and 7 minus 5 equals 2.
2. Subtraction borrows one digit and adds one to ten digits. For example, 6 minus 8 equals -2, and the tenth digit plus 1 becomes 5 minus 8 equals 7. Two-digit subtraction formula, single-digit subtraction does not abdicate, and ten-digit subtraction borrows. For example, 33 minus 18, unit 3 minus 8 equals 5, and decimal digit 2 minus 1 equals 1, so the answer is 15.
3. Ten-digit subtraction does not abdicate, and single-digit subtraction borrows. For example, 48 minus 25, 10 digit 4 minus 2 equals 2, and 8 minus 5 equals 3, so the answer is 23. Subtract two digits, subtract all digits, and add ten and subtract one. For example, if you subtract 38 from 75, it will become 15 after subtracting 8, which is equal to 7, and the number of 10 minus 3 is equal to 4, so the answer is 47.
Related knowledge of subtraction formula
1, subtraction is one of the four operations, and the operation of subtracting one number from another is called subtraction. Subtract the meaning of each part, the number to the left of the minus sign is called the minuend, and the number to the right of the minus sign is called the subtraction, and the result is called the difference. The operational nature of subtraction is that the minuend is unchanged, the meiosis increases and the difference decreases. Meiosis increased, meiosis decreased and the difference increased.
2. The minuend adds (or subtracts) a number, the minuend remains the same, and the difference is added and subtracted. Subtraction formula is a traditional mathematical formula in China, which is used to teach children the basic operation rules of subtraction. Subtraction formulas include one, two, three, four, five, six, seven, eight and nine, and each formula consists of a short sentence, which is convenient for memorizing and reciting.
3. Subtraction formula can help children quickly master the basic operation rules of subtraction and improve the accuracy and speed of mathematical operation. Besides subtraction formula, there are other mathematical formulas such as multiplication formula, which are important mathematical education resources in China traditional culture. Definition of subtraction, subtraction is a binary operation, which represents the result of subtracting one number from another.