Jim-Mellon

2022-07-11 00:34 UTC

gravatar for Jim-Mellon

In the Basic section, How to subtract 2 numbers, We need to make a borrow.

How to perform these operations?

1-2; 1-3; 1-4; 1-5; 1-6; 1-7; 1-8; 1-9;
2-2; 2-3; 2-4; 2-5; 2-6; 2-7; 2-8; 2-9;
3-4; 3-5; 3-6; 3-7; 3-8; 3-9;
4-5; 4-6; 4-7; 4-8; 4-9;
5-6; 5-7; 5-8; 5-9;
6-7; 6-8; 6-9;
7-8; 7-9;
8-9;

solsTiCe d'Hiver

2022-07-11 10:34 UTC

gravatar for solsTiCe d'Hiver

Hello,

When the digit to substract is greater than the digit minuend, you make a borrow, or you consider you subtract to the 2 digit number by using the column to the left.

So for example, if 11 - 2, you do not perform 1-2 but 11-2 and to do so, you perform 10-2.

Another example, 91 -5: you can't do 1 - 5 directly so you do 10 - 5, by borrowing a 1 on the left column.