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Number - Proper and Improper Fractions on the Number Line

Grade 6IB

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

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A proper fraction is a fraction where the numerator is less than the denominator (Numerator<Denominator\text{Numerator} < \text{Denominator}). These fractions represent a value less than 11 and are located between 00 and 11 on the number line.

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An improper fraction is a fraction where the numerator is greater than or equal to the denominator (Numerator≥Denominator\text{Numerator} \ge \text{Denominator}). These fractions represent values greater than or equal to 11 and are located at or to the right of 11 on the number line.

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To represent a fraction ab\frac{a}{b} on a number line, divide each whole unit (e.g., the space between 00 and 11, or 11 and 22) into bb equal parts. Each part represents the unit fraction 1b\frac{1}{b}.

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Improper fractions can be converted into mixed numbers to make them easier to plot. For example, 73\frac{7}{3} can be written as 2132 \frac{1}{3}, meaning it is located 13\frac{1}{3} of the way between 22 and 33.

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On the number line, as you move from left to right, the value of the fractions increases.

📐Formulae

Proper Fraction: ab where a<b\text{Proper Fraction: } \frac{a}{b} \text{ where } a < b

Improper Fraction: ab where a≥b\text{Improper Fraction: } \frac{a}{b} \text{ where } a \ge b

Mixed Number=QuotientRemainderDivisor\text{Mixed Number} = \text{Quotient} \frac{\text{Remainder}}{\text{Divisor}}

Improper Fraction=(Whole Number×Denominator)+NumeratorDenominator\text{Improper Fraction} = \frac{(\text{Whole Number} \times \text{Denominator}) + \text{Numerator}}{\text{Denominator}}

💡Examples

Problem 1:

Represent the proper fraction 34\frac{3}{4} on a number line.

Solution:

  1. Draw a number line and mark 00 and 11.
  2. Divide the segment between 00 and 11 into 44 equal parts (since the denominator is 44).
  3. Starting from 00, count 33 marks to the right.
  4. The third mark represents 34\frac{3}{4}.

Explanation:

Since 34\frac{3}{4} is a proper fraction, it must lie between 00 and 11. Dividing the unit into 44 parts gives segments of 14,24,34\frac{1}{4}, \frac{2}{4}, \frac{3}{4}, and 44\frac{4}{4} (which is 11).

Problem 2:

Locate the improper fraction 114\frac{11}{4} on the number line.

Solution:

  1. Convert 114\frac{11}{4} to a mixed number: 11÷4=211 \div 4 = 2 with a remainder of 33. So, 114=234\frac{11}{4} = 2 \frac{3}{4}.
  2. This point lies between the whole numbers 22 and 33.
  3. Divide the space between 22 and 33 into 44 equal parts.
  4. The point 114\frac{11}{4} is the 33rd mark after the number 22.

Explanation:

Converting to a mixed number helps identify which two integers the improper fraction falls between. 114\frac{11}{4} is greater than 22 but less than 33.

Problem 3:

Identify the fraction represented by point PP if it is at the 22nd mark between 11 and 22, where the interval is divided into 55 equal parts.

Solution:

  1. The interval is between 11 and 22, so the whole number part is 11.
  2. The denominator is 55 because there are 55 equal parts.
  3. The numerator is 22 because it is at the 22nd mark.
  4. Point P=125P = 1 \frac{2}{5}.
  5. As an improper fraction: 125=(1×5)+25=751 \frac{2}{5} = \frac{(1 \times 5) + 2}{5} = \frac{7}{5}.

Explanation:

The position 1251 \frac{2}{5} indicates we have passed the whole number 11 and moved an additional 25\frac{2}{5} towards 22.