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Equivalent fractions with models

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5201923
A large pizza is cut into \(8\) equal slices. Lucas eats \(2\) slices, Sarah eats \(1\) slice, and the rest is left for their parents. Write the fraction of the pizza eaten by Lucas, the fraction eaten by Sarah, and the fraction left for their parents.

Hints

- How many equal slices make the whole pizza? - A fraction tells how many equal parts of a whole are being described. - How many slices remain after Lucas and Sarah eat theirs? - Can any fraction be written in an equivalent simpler form?

Solution

1. The whole pizza has \(8\) equal slices. 2. Lucas eats \(2\) of the \(8\) slices, so his fraction is \(\frac{2}{8} = \frac{1}{4}\). 3. Sarah eats \(1\) of the \(8\) slices, so her fraction is \(\frac{1}{8}\). 4. The parents receive \(8 - 2 - 1 = 5\) slices, so their fraction is \(\frac{5}{8}\).

Answer

Lucas: \(\frac{1}{4}\) (or \(\frac{2}{8}\)) Sarah: \(\frac{1}{8}\) Parents: \(\frac{5}{8}\)
5355543
A paper strip is divided into equal sections, as shown in the figure. a) How many sections are in the strip altogether? b) How many sections are shaded? c) What fraction of the strip is shaded? d) What fraction of the strip is unshaded?
Figure for problem 535554

Hints

- Count all the sections to find the denominator. - The number of shaded sections gives the numerator for the shaded fraction. - For the unshaded fraction, determine how many sections remain.

Solution

1. Count all the sections: the strip has \(6\) equal sections. 2. Count the shaded sections: \(2\) sections are shaded. 3. The shaded fraction is \(\frac{2}{6} = \frac{1}{3}\). 4. The number of unshaded sections is \(6 - 2 = 4\). 5. The unshaded fraction is \(\frac{4}{6} = \frac{2}{3}\).

Answer

a) \(6\) b) \(2\) c) \(\frac{2}{6}\), or \(\frac{1}{3}\) d) \(\frac{4}{6}\), or \(\frac{2}{3}\)
5358693
Look at the four figures. For each figure, determine: 1. What fraction of the figure is shaded? 2. What fraction of the figure is unshaded? Write each answer as a fraction.
Figure for problem 535869

Hints

- Count the equal parts in each figure. That number is the denominator. - Count the shaded parts for the numerator of the first fraction. - The remaining parts form the numerator of the unshaded fraction.

Solution

1. Figure a) has \(5\) equal parts, with \(2\) shaded. The shaded fraction is \(\frac{2}{5}\), and the unshaded fraction is \(\frac{3}{5}\). 2. Figure b) has \(4\) equal parts, with \(1\) shaded. The shaded fraction is \(\frac{1}{4}\), and the unshaded fraction is \(\frac{3}{4}\). 3. Figure c) has \(6\) equal parts, with \(4\) shaded. The shaded fraction is \(\frac{4}{6} = \frac{2}{3}\), and the unshaded fraction is \(\frac{2}{6} = \frac{1}{3}\). 4. Figure d) has \(6\) equal parts, with \(5\) shaded. The shaded fraction is \(\frac{5}{6}\), and the unshaded fraction is \(\frac{1}{6}\).

Answer

a) shaded: \(\frac{2}{5}\); unshaded: \(\frac{3}{5}\) b) shaded: \(\frac{1}{4}\); unshaded: \(\frac{3}{4}\) c) shaded: \(\frac{4}{6}\), or \(\frac{2}{3}\); unshaded: \(\frac{2}{6}\), or \(\frac{1}{3}\) d) shaded: \(\frac{5}{6}\); unshaded: \(\frac{1}{6}\)
5355093
Figures a), b), and c) each show a shaded fraction of a whole. Which figure shows a different fraction from the other two? Explain by comparing the fractions.
Figure for problem 535509

Hints

- Write the shaded fraction for each figure. - Look for fractions that name the same amount even though the numerators and denominators differ. - Use the models to compare the shaded portions.

Solution

1. Figure a) shows \(\frac{1}{4}\). 2. Figure b) shows \(\frac{2}{8}\), which is equivalent to \(\frac{1}{4}\). 3. Figure c) shows \(\frac{2}{6}\), which is equivalent to \(\frac{1}{3}\). 4. Figures a) and b) show the same fraction, while figure c) shows a different fraction.

Answer

Figure c). Figures a) and b) both show \(\frac{1}{4}\), while figure c) shows \(\frac{1}{3}\).
5382083
Compare the two pie charts. 1) Which color has the largest slice in both charts? 2) Are the two charts divided in the same proportions?
Figure for problem 538208

Hints

- Find the total in each chart. - Compare each color as a fraction of its chart total. - Equal fractions make equal proportional slices.

Solution

1. Red is the largest slice in both charts. 2. In a), the total is \(12 + 8 + 4 = 24\). The slices are \(\frac{12}{24} = \frac{1}{2}\), \(\frac{8}{24} = \frac{1}{3}\), and \(\frac{4}{24} = \frac{1}{6}\). 3. In b), the total is \(9 + 6 + 3 = 18\). The slices are \(\frac{9}{18} = \frac{1}{2}\), \(\frac{6}{18} = \frac{1}{3}\), and \(\frac{3}{18} = \frac{1}{6}\). 4. The corresponding fractions are equal, so the charts have the same proportions.

Answer

1) Red is largest in both charts. 2) Yes, the charts are divided in the same proportions.
5382103
Section A has a value of \(10\) in both pie charts. Is its slice also the same size in both charts? Explain.
Figure for problem 538210

Hints

- Find the total in each chart. - Write A as a fraction of each total. - Compare the two fractions.

Solution

1. The total in a) is \(10 + 10 + 10 = 30\). 2. The total in b) is \(10 + 15 + 5 = 30\). 3. In both charts, Section A is \(\frac{10}{30} = \frac{1}{3}\) of the whole. 4. Therefore, its slices are equal in size.

Answer

Yes. Section A is one-third of each chart, so its slices are equal in size.

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