When calculating addition and subtraction, what digits should be aligned and from what digits

When doing addition and subtraction, you should align the (same) digits, starting from the (number) digits.

Algorithm of addition and subtraction:

1) Alignment of the same digits;

2) Count from single digits;

3) In addition, if there are dozens full, go to the higher one; When the subtraction is not enough, it will be subtracted from the higher digit by 1 when 10 and the original digit are added and then subtracted.

Extended Information: The Nature of Addition:

1) Addition commutative law: a+b=b+a;

2) Associative law of addition.

a+b+c=a+(b+c)=(a+b)+c。

The nature of subtraction.

1) Subtracting several numbers from a number in a row is equal to subtracting the sum of these numbers from this number.

a-b-c-d=a-(b+c+d)。

2) The sum of several numbers minus a number is equal to the continuous subtraction of these numbers from this number.

a-(b+c+d)=a-b-c-d。

3) The nature of addition and subtraction mixed operation to remove parentheses, pay attention to the change of addition and subtraction symbols when removing parentheses.

a+(b-c)=a+b-c；a-(b+c)=a-b-c；a-(b-c)=a-b+c。

The two-digit pen calculation, addition and subtraction should align the same digits, all starting from the single digit, adding and subtracting the numbers on the same digits.

Pay attention to the addition and subtraction of pen arithmetic: the same digit is aligned, from the single digit, which digit of the number is added to the full ten, it is necessary to advance one to the previous one, which one is not enough to subtract, from the previous digit to the one, add 10 to the base and then subtract

So the answer is: alignment, one, previous digit, one step back, 10

When calculating addition and subtraction, align (the same digits), starting from the lowest digit.

When adding and subtracting from the pen, the (digits) should be aligned, starting from the (single digits).

When doing addition and subtraction, you should align (the same digits) and start from (number) digits.

Pen addition and subtraction align the decimal point, starting from the lowest digit (the rightmost digit).

When adding and subtracting from the pen, the (digits) should be aligned, starting from the (single digits).

Hope it helps!

To align the decimal point, start with the lowest digit.

Pen multiplication starts from the single digit. Got it?

When adding and subtracting, the same digits must be aligned, starting from a single digit, not a ten.

Is it accurate to count from single digit to single digit to ten digits, and it is necessary to start from the single digit.

Align from the last digit onwards.

Number of digits are aligned from single digits.

When adding and subtracting from the pen, it is necessary to align (single digits) and start from (single digits).

When doing addition and subtraction, align the same digits.

To align (in the same position), from the highest position.

Bai went in tightly, authoritarian rain butterflies tightened the classic towing sonar.

Pen arithmetic addition and subtraction should align the same digits, from the single digit, pen arithmetic is a method of writing out the formula or calculating the grass with a pen, which is the most commonly used calculation method in mathematics, and its related calculation method is mental arithmetic.

Addition is one of the four basic operations, which refers to the calculation of combining two or more numbers and quantities into one number or quantity. The symbol for addition is the plus sign "+", and when adding, the items are connected with a plus sign.

When adding and subtracting, the same digits should be aligned, starting from the single digit

So the answer is: the same; pcs