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Question

Find the value of the following expression:

\(\frac{{3 \div 1 \times 2 + 5 - 2}}{{3 \times 3 - 2}}\)

The correct answer is \(\frac{9}{7}\)

To find the value of the given expression, we need to follow the order of operations. A commonly used rule for the order of operations is BODMAS or PEMDAS.

BODMAS stands for:

  • Brackets
  • Order (powers, roots)
  • Division and Multiplication (from left to right)
  • Addition and Subtraction (from left to right)

PEMDAS stands for:

  • Parentheses
  • Exponents
  • Multiplication and Division (from left to right)
  • Addition and Subtraction (from left to right)

Both rules give the same result as they represent the same hierarchy of operations.

Evaluating the Expression

The given expression is:

\(\frac{{3 \div 1 \times 2 + 5 - 2}}{{3 \times 3 - 2}}\)

We will evaluate the numerator and the denominator separately.

Calculating the Numerator

The numerator is \(3 \div 1 \times 2 + 5 - 2\).

Applying the BODMAS/PEMDAS rule:

  1. Division and Multiplication (from left to right):
    • First, \(3 \div 1\). \(3 \div 1 = 3\). The expression becomes \(3 \times 2 + 5 - 2\).
    • Next, \(3 \times 2\). \(3 \times 2 = 6\). The expression becomes \(6 + 5 - 2\).
  2. Addition and Subtraction (from left to right):
    • First, \(6 + 5\). \(6 + 5 = 11\). The expression becomes \(11 - 2\).
    • Next, \(11 - 2\). \(11 - 2 = 9\).

So, the value of the numerator is 9.

Calculating the Denominator

The denominator is \(3 \times 3 - 2\).

Applying the BODMAS/PEMDAS rule:

  1. Multiplication:
    • First, \(3 \times 3\). \(3 \times 3 = 9\). The expression becomes \(9 - 2\).
  2. Subtraction:
    • Next, \(9 - 2\). \(9 - 2 = 7\).

So, the value of the denominator is 7.

Finding the Final Value

Now, we combine the values of the numerator and the denominator:

\(\frac{\text{Numerator}}{\text{Denominator}} = \frac{9}{7}\)

The value of the expression is \(\frac{9}{7}\).

Revision Table: Order of Operations

Rule Order Operations
BODMAS/PEMDAS 1st Brackets/Parentheses
2nd Order/Exponents (powers, roots)
3rd Division and Multiplication (left to right)
4th Addition and Subtraction (left to right)

Additional Information: Applying BODMAS Correctly

It is crucial to apply the BODMAS or PEMDAS rule carefully. When you have a mix of division and multiplication or a mix of addition and subtraction, you must perform these operations from left to right as they appear in the expression. They have equal priority.

For example, in \(6 \div 2 \times 3\):

  • Correct: \(6 \div 2 = 3\), then \(3 \times 3 = 9\).
  • Incorrect: \(2 \times 3 = 6\), then \(6 \div 6 = 1\).

Similarly, in \(10 - 3 + 5\):

  • Correct: \(10 - 3 = 7\), then \(7 + 5 = 12\).
  • Incorrect: \(3 + 5 = 8\), then \(10 - 8 = 2\).

Always work from left to right for operations at the same priority level (Division/Multiplication or Addition/Subtraction).

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Important Questions from Fractions

  1. Which fraction among the following is the least ?

    \(\frac{5}{11}, \frac{7}{12}, \frac{8}{13}, \frac{9}{17}\)

  2. Simplify the expression 441 ÷  \(\left[270 \div \frac{3}{7}+\left(17\div \frac{1}{3}\right)-\left(8\frac{1}{2}-\frac{5}{2}\right)\right]\)

  3. If the sum of two positive numbers is 65 and the square root of their product is 26, then the sum of their reciprocals is:

  4. The value of \(9 \div [\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{6}\div(\frac{3}{4}-\frac{1}{3})\;of\;\frac{2}{9}]\)  is:

  5. The value of \(3\frac{1}{5} \div 4\frac{1}{2}\;of\;5\frac{1}{3} + \frac{1}{8} \div \frac{1}{2}of\frac{1}{4} - \frac{1}{4}\left( {\frac{1}{2} \div \frac{1}{8} \times \frac{1}{4}} \right)\)  is:

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