Subtract Decimals: 28.18 - 19.29 in Vertical Format

Solve the following exercise in the correct order:

Let's subtract the hundreds after the decimal point:

$8-9=$

Given that we cannot subtract, we will instead borrow ten from the tenths after the decimal point and obtain the following:

$18-9=9$

Let's subtract the tenths after the decimal point, remembering that we borrowed ten, therefore:

$1-1-2=0-2$

Due to the fact that we cannot subtract, we will instead borrow ten from the tens digit of the whole number as shown below:

$10-2=8$

Finally, let's proceed to subtract the whole numbers before the decimal point accordingly.

Since we borrowed ten from the tens digit of the whole number, we will obtain the following:

$8-1-9=7-9$

Given that we cannot subtract, we will instead borrow ten from the ones digit of the whole number as shown below:

$17-9=8$

Remember that we borrowed ten from the ones digit, therefore we obtain the following:

$2-1-1=0$

And we obtain:

$28.18\\-19.29\\08.89$

Ignoring the 0 before the 8, we obtain the number: 8.89