Solve the following expression:
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Solve the following expression:
Let's begin by breaking down 5.4 into a subtraction exercise as follows:
Now let's convert the exercise into a subtraction operation with fractions:
Let's proceed to combine the subtraction exercise between the fractions into one fraction:
Let's write the second decimal fraction as a simple fraction:
Below is the resulting exercise:
Let's convert the division exercise into a multiplication exercise not forgetting to switch between the numerator and denominator in the second fraction:
Finally let's reduce the 10 in both fractions and we should obtain the following:
What will be the sign of the result of the next exercise?
\( (-2)\cdot(-4)= \)
The sign rule for division states that when you divide two numbers with the same sign, the result is always positive. Think of it as: negative ÷ negative = positive, just like positive ÷ positive = positive.
Not always! You can divide decimals directly: . Converting to fractions just makes the steps clearer and helps avoid decimal calculation errors.
Think of it as 54 ÷ 9 = 6. When both decimals have the same number of decimal places, you can ignore the decimal points temporarily and divide the whole numbers.
Sometimes you'll get a repeating decimal or need to round. In this problem, divides evenly to give exactly 6, which is why our answer is a whole number.
Use multiplication! If , then should equal . Try it: ✓
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