Line up the point to add or subtract; count places to multiply.
Read this first — it covers the idea in plain language with a worked example.
Stack the numbers so the decimal points line up, then add or subtract like whole numbers. Fill empty spots with zeros so every column has a digit.
4.5 − 2.75
Ignore the decimal points and multiply like whole numbers. Then count the total number of decimal places in both factors and place the point that many spots from the right.
0.6 × 0.4
Watch out
When multiplying you do NOT line up the decimal points — lining up is only for adding and subtracting.
Watch the main video, then check the second take if you want another explanation.
Line up the decimal points, then subtract like whole numbers.
Watch on YouTubeTry a worksheet or work through some problems before the quiz.
Apply decimal and fraction operations to real situations.
A couple of questions to make sure this topic stuck. Retake as many times as you want.
Decimal Operations
0.6 × 0.4 = ?
