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Decimal numbers
Dynamic tasks on tenths and hundredths, comparing, adding and subtracting decimals, place value and sequences.
Questions: 10Estimated time: 14 minutes
Time left: 00:00:00
Best results on this test
Top 10 registered students. Only each student’s best result in the period counts.
Sample questions
- Write the fraction ___ as a decimal.
- Compare the decimals: ___ ___
- Calculate: ___ + ___
- Calculate: ___ − ___
Decimal numbers
In a decimal number, the decimal point separates the whole-number part from the fractional part. The first digit after the point represents tenths and the second represents hundredths. For example, 0.37 is 3 tenths and 7 hundredths, or 37/100.
Comparison and operations
To compare decimals, compare whole-number parts first, followed by tenths, hundredths and later places. Zeros may be added at the end without changing the value: 0.5 = 0.50. For addition and subtraction, align the decimal points vertically.
A common mistake is to assume that a decimal with more digits is always greater. For example, 0.8 is greater than 0.75 because 8 tenths equal 80 hundredths. Place-value reasoning and estimation provide useful checks.
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