15.8 − 6.73 is equal to
8.07
9.07
9.13
9.25
Step 1: Line up decimals.
Write 15.8 as 15.80 so both numbers have two decimal places.
Step 2: Set up subtraction.
15.80 − 6.73
Step 3: Subtract hundredths.
0 − 3 cannot be done.
Borrow 1 from the tenths: 8 tenths becomes 7 tenths, and hundredths become 10.
Now 10 − 3 = 7 hundredths.
Step 4: Subtract tenths.
7 − 7 = 0 tenths.
Step 5: Subtract ones (borrow from tens).
We need 5 − 6, which cannot be done.
Borrow 1 ten from the tens place: tens go from 1 to 0, and ones become 15.
Now 15 − 6 = 9 ones.
Step 6: Tens place.
0 − 0 = 0 tens.
Result: Put the decimal point in the same column.
15.80 − 6.73 = 9.07.