* Borrowing subtraction arithmetic exercises within 20 (first grade of primary school, second volume);
In addition, you can also generate borrowing subtraction arithmetic exercises within 50, within 100, within 500, within 1000, and within 10000 for targeted exercises.
Key Points
1. The concept of borrowing:
Borrowing means that in subtraction, when the number of a certain counting unit is not enough to subtract, you need to borrow one from the higher digit to the lower digit, add 10 to the lower digit, and then perform subtraction;
2. Borrowing exercises:
For example, 65 - 28; align the same digits, subtract from the ones digit, and if the number on a digit is not enough to subtract, borrow 1 from the previous digit to make 10, add the number on the original digit and subtract again;
1 ) Align the same digits; align the ones digit 5 with 8, and align the tens digit 6 with 2;
2 ) Subtract from the ones digit; if the ones digit 5 - 8 is not enough to subtract, you need to borrow 1 from the previous digit (tens digit) as ten, which is equivalent to giving this -digit plus Add 10, the ones digit becomes 15 - 8 = 7; then calculate the tens digit, because the tens digit is borrowed 1, the ten-digit minuend 6 becomes 5 (because it is borrowed 1, it needs to be subtracted), 5 - 2 = 3; the result is 37;
