1, ten digits plus ten digits, one digit plus one digit: refers to the calculation of separating ten digits from one digit by two digits.
2. Add ten digits first, then one digit: it refers to splitting one of the formulas, usually divided into "ten" and "several".
Second, the subtraction part: "ten places are subtracted from ten places, and one place is subtracted from one place" and "ten places are subtracted first, then one place is subtracted."
1, where ten digits are subtracted from ten digits, and one digit is subtracted from one digit: refers to splitting two numbers in the formula and then performing operations in the order specified in the formula.
2. Subtract ten digits first and then one digit: It means that the number in subtraction is divided into the combination of "ten" and "several" before calculation.
Extended data
Subtraction attribute
a-b-c=a-(b+c)
1, a number minus or plus a number, plus or minus the same number, the number remains the same. That is, A-B+B = A or a+b-b.
2. If you subtract a number from the sum of n numbers, you can subtract this number from any addend (if it can be subtracted) and then add it to the rest of the addends, such as (a+b+c)-d = (a-d)+b+c.
3. If you subtract a number from the sum of n numbers, you can subtract each addend in the sum from this number in turn, for example, a-(b+c+d) = a-b-c-d.
4. If a number subtracts the difference between two numbers, you can subtract the minuend in the difference from this number (if you can subtract it) and add the minuend in the difference; Or add subtraction in the difference first, and then subtract the minuend in the difference, that is, a-(b-c) = a-b+c or a-(b-c) = a+c-b.