Problem 64 - Algebra 1: Concepts and Skills

Question

Find the difference. $$ 13.8-6.9 $$

Step-by-Step Solution

Answer

6.9

Step 1: Line up the decimals

When subtracting decimals, the first step is to line up the decimals of the two numbers.

Step 2: Subtract

After getting the decimals in order, perform the subtraction just like a regular subtraction operation. If the digit in the subtrahend (here, 6.9) is larger than the digit in the same place value in the minuend (here, 13.8), borrow 1 from the digit in the next left place value in the minuend. This makes the digit in the minuend 10 plus the original, which is now more than the digit in the subtrahend.

Step 3: Write down the result

After performing the subtraction, write down the final result, keeping the decimal in the correct place. This is the answer to the problem.