Decimals Quiz

Subtracting 0.1 from 0.5 results in 0.4. In decimal subtraction, you align the decimal points and subtract each column from right to left. Subtracting 0.1 from 0.5 involves borrowing if the decimal is extended to more places, but in this simple case, the calculation is straightforward.

Subtracting 0.4 from 0.9 gives 0.5. Aligning the decimals and subtracting directly, you subtract each column, simplifying to a direct computation that shows how smaller numbers subtract from larger numbers in decimal form without additional complexity.

Adding 0.3 to 0.6 results in 0.9. This operation involves simple addition where you align the decimals and add up the digits. Both numbers have one decimal place, so the addition is straightforward, resulting in 0.9. This example shows basic decimal addition, essential for everyday calculations.

Multiplying 0.2 by 0.3 gives 0.06. To multiply decimals, first multiply as if they were whole numbers (2 * 3 = 6). Since the total number of decimal places in the factors is 2 (one in each number), you place two decimal places in the product, converting 6 into 0.06.

Dividing 0.9 by 0.3 results in 3. In decimal division, you determine how many times the divisor fits into the dividend. Since 0.3 fits three times into 0.9, the quotient is 3. This operation showcases how division can simplify to a more manageable form by eliminating decimal points when possible.

Adding 0.5 and 0.25 yields 0.75. This addition involves aligning the decimal points and adding the numbers column by column. Since 0.5 can be expressed as 0.50, adding 0.50 and 0.25 results in 0.75. This operation demonstrates the importance of place value in decimal addition, where each digit must be accurately positioned for correct summation.

To convert a fraction to a decimal, divide the numerator (top number) by the denominator (bottom number). In this case, 1 divided by 4 equals 0.25.  Sources and related content

Adding 0.12 and 0.08 results in 0.20. When adding these decimals, align the decimal points and add the digits column by column. The addition of 12 and 8 yields 20, placing the decimal gives 0.20, showcasing straightforward addition without carryover.

Rounding 0.666 to the nearest tenth gives 0.7. In rounding, you look at the digit immediately after the place to which you are rounding (here, the hundredth place). If this digit is 5 or greater, you round up the tenths place. Thus, 0.666 rounds up to 0.7.

Multiplying 0.5 by 0.04 gives 0.02. You multiply the numbers ignoring the decimals (5 * 4 = 20) and then count the total number of decimal places in the original numbers (1 in 0.5 and 2 in 0.04, totaling 3). Placing three decimal places from the right in 20 gives 0.02.