Mastering Operations with Decimals
Mastering Operations with Decimals
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Mastering Operations with Decimals
What do you already know about decimal numbers and their operations?
Learning Objective
At the end of the lesson you will be able to perform addition, subtraction, multiplication, and division with decimal numbers accurately.
What Are Decimal Numbers?
Decimals are numbers that use a decimal point to show a value less than one. They are important in expressing fractions, measurements, and currency.
Addition and Subtraction
To add or subtract decimals, align the decimal points and add zeros if needed. Calculate as you would with whole numbers.
Multiplication with Decimals
Multiply as with whole numbers. Count the number of decimal places in both numbers. The product should have that many decimal places.
Division with Decimals
Move the decimal point in the divisor to the right to make it a whole number. Move the decimal in the dividend the same number of places. Divide as usual.
Common Mistakes to Avoid
Do not forget to align decimal points when adding or subtracting. Always count decimal places carefully for multiplication and division.
Try It Yourself!
Calculate: 3.75 + 2.4, 5.2 - 1.36, 0.85 × 0.4, 4.2 ÷ 0.7. Check your answers with a partner.
Summary
You have learned the rules for adding, subtracting, multiplying, and dividing decimal numbers. Practise to become confident in these essential skills.
Write down 3 things you learned in this lesson.
Write down 2 things you want to know more about.
Ask 1 question about something you haven't quite understood yet.
