First, the calculation is convenient.
When adding and subtracting, it is more convenient to start with one digit. This is because the rules of addition and subtraction operation determine that the number of digits in the result will directly affect the number of digits in the tenth place, thus affecting the higher number of digits. Therefore, it is more convenient to get the correct result by starting from one bit.
Second, avoid carrying and borrowing.
When adding and subtracting multiple digits, there may be carry and borrow if the calculation starts from the high position. This will increase the complexity and difficulty of calculation. Starting with single digits can avoid this situation, because carry and borrow only affect the high position, but not the calculation of single digits.
Third, improve the accuracy of calculation.
Multi-digit addition and subtraction, if the calculation starts from the high digit, there may be a high digit calculation error. This will make the whole calculation result inaccurate. Starting with one digit can improve the accuracy of calculation, because the calculation on each digit is independent and will not affect each other.
Methods to avoid calculation errors
First, check the questions and data carefully.
Before you start the calculation, make sure that you have understood the requirements of the topic and carefully checked all the data provided. If possible, read the topic again to make sure you understand the requirements of the topic.
Second, use draft paper.
Using draft paper for calculation can avoid confusion and mistakes. Calculate step by step on the draft paper and write down every step. In this way, you can go back and check the calculation process of each step. If you find an error, it is easier to find the problem.
Third, checking calculation.
After the calculation is completed, it is very important to check. Recalculate or use different methods to check the answer to ensure that the final answer is accurate. Sometimes, using two different methods to check can find possible errors more effectively.