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Decimals Quiz with Answers

Practice decimal place value, rounding and arithmetic.

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Choose a focused 5-question round or try 10 mixed questions from all levels. You can repeat the quiz and improve your personal best.

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How to use the Decimals Quiz

Start an Easy, Intermediate, Advanced or Mixed round. Select one of four answers, check it, and read the full explanation before continuing. Each focused round has five questions; a mixed round has ten. Review missed questions at the end, then try another round.

Use our Rounding Calculator for extra practice. Your best score stays only in this browser.

Frequently asked questions

Is this quiz free?

Yes. Every round is free, with answers, explanations and no registration requirement.

Can I choose the difficulty?

Choose Easy, Intermediate or Advanced for a focused five-question round, or Mixed for ten questions from all levels. Try again to improve your personal best.

More practice and calculators

Continue with Percentage Calculator · Median Mode Range Calculator or browse all learning quizzes. Check your calculations with the Rounding Calculator.

Learn Decimals Quiz topics before you start

Understanding decimal place value

Digits after the decimal point represent tenths, hundredths, thousandths and smaller units. In 4.57, the digit 5 is in the tenths place and the 7 is in the hundredths place. To compare decimals, write enough zeros to align the decimal places: 0.7 = 0.70, which is larger than 0.65.

Decimal arithmetic

Align decimal points when adding or subtracting, not just the final digit. For 1.2 + 3.4, the answer is 4.6. When multiplying, first multiply as whole numbers, then count decimal places in the inputs: 0.4 × 0.3 = 0.12. In division by a decimal, shift both numbers by the same power of ten so the divisor becomes a whole number.

Rounding and common mistakes

To round 5.786 to two decimal places, inspect the third decimal digit, 6, and round the hundredths digit upward: 5.79. For scientific notation, normalize the leading number so it lies between 1 and 10, and adjust the exponent to preserve the value. Always distinguish a rounded answer from an exact value, particularly in measurement and money calculations.

Take the Decimals Quiz above, then explore the Rounding Calculator to verify your own examples. Find other free skill checks in the quiz directory.