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Build your own math worksheets from 21,000 problems for grades 3 to 12, from fractions to calculus. Every problem includes step-by-step solutions.

Unit fractions and partitioning

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5357093
What fraction of each figure is shaded? Write each answer as a fraction and in words.
Figure for problem 535709

Hints

- Count all equal parts or objects to find the denominator. - Count the shaded parts or objects to find the numerator. - Read the numerator as a counting number and use the fraction name for the denominator.

Solution

1. In a), \(3\) of \(8\) equal sectors are shaded, so the fraction is \(\frac{3}{8}\), or three eighths. 2. In b), \(2\) of \(5\) equal parts are shaded, so the fraction is \(\frac{2}{5}\), or two fifths. 3. In c), \(7\) of \(12\) objects are shaded, so the fraction is \(\frac{7}{12}\), or seven twelfths.

Answer

a) \(\frac{3}{8}\); three eighths b) \(\frac{2}{5}\); two fifths c) \(\frac{7}{12}\); seven twelfths
5201953
A flower bed is divided into \(4\) equal sections. Red roses grow in \(1\) section, blue forget-me-nots grow in \(2\) sections, and yellow sunflowers grow in the remaining section. a) What fraction of the bed contains blue forget-me-nots? b) What fraction contains yellow sunflowers? c) Compare the fractions for the red roses and yellow sunflowers. What do you notice?

Hints

- How many equal sections make the whole bed? That number is the denominator. - Count how many sections each flower type covers. - After accounting for the red and blue flowers, how many sections remain for the yellow flowers? - Compare the fractions for the red and yellow flowers.

Solution

1. The whole bed has \(4\) equal sections. 2. The blue flowers cover \(2\) of the \(4\) sections, so they cover \(\frac{2}{4} = \frac{1}{2}\). 3. The yellow flowers cover \(4 - 1 - 2 = 1\) section, so they cover \(\frac{1}{4}\). 4. The red roses and yellow sunflowers each cover \(1\) of the \(4\) equal sections, so their fractions are equal.

Answer

a) \(\frac{2}{4}\), or \(\frac{1}{2}\) b) \(\frac{1}{4}\) c) The fractions are equal because each flower type covers \(\frac{1}{4}\) of the bed.
5319973
Emma cuts a round cake into \(8\) equal slices. The slices that remain are shaded yellow in the figure. a) How many slices of cake remain? b) What fraction of the cake remains? c) What fraction of the cake has already been eaten?
Figure for problem 531997

Hints

- Count the total number of equal parts in the whole cake. - How many parts are shaded yellow? - Use the number of selected parts as the numerator and the total number of parts as the denominator. - How many unshaded slices are needed to complete the whole cake?

Solution

1. Count the yellow slices: \(5\) slices remain. 2. The cake has \(8\) equal slices, so the fraction remaining is \(\frac{5}{8}\). 3. The number eaten is \(8 - 5 = 3\), so the fraction eaten is \(\frac{3}{8}\).

Answer

a) \(5\) slices b) \(\frac{5}{8}\) c) \(\frac{3}{8}\)
5355083
A fence has \(8\) boards of equal width. The blue-shaded boards in the diagram have already been painted. What fraction of the fence still needs to be painted?
Figure for problem 535508

Hints

- Count the total number of equal boards. - Count the blue-shaded boards, then find how many are unshaded. - Write the number of unshaded boards over the total number of boards.

Solution

1. The fence has \(8\) equal boards in all. 2. The diagram shows \(3\) painted boards, so \(8-3=5\) boards remain unpainted. 3. Therefore, the fraction that still needs to be painted is \(\frac{5}{8}\).

Answer

\(\frac{5}{8}\) of the fence still needs to be painted.
5355203
A bag of trail mix contains \(\frac{1}{2}\) peanuts, \(\frac{1}{4}\) cashews, \(\frac{1}{8}\) almonds, and \(\frac{1}{8}\) raisins. Match each ingredient to a labeled sector in the circle model. The almond and raisin portions are equal, so those two labels cannot be matched uniquely. Explain your reasoning using the fractions.
Figure for problem 535520

Hints

- Identify the labeled sector that covers half of the circle. - Find the labeled sector that is half as large as the one-half sector. - Compare the two smallest labeled sectors with the one-fourth sector.

Solution

1. Sector A covers one half of the circle, so it represents the peanuts. 2. Sector B covers one fourth of the circle, so it represents the cashews. 3. Sectors C and D each cover one eighth of the circle. They represent the almonds and raisins in either order.

Answer

Peanuts: A, \(\frac{1}{2}\) Cashews: B, \(\frac{1}{4}\) Almonds and raisins: C and D in either order, \(\frac{1}{8}\) each
5355663
A pizza is cut into \(10\) equal slices. The shaded slices have pepperoni, and the unshaded slices have only cheese. a) How many slices have only cheese? b) What fraction of the pizza has pepperoni? c) What fraction of the pizza has only cheese? d) Which two fractions combine to make one whole pizza?
Figure for problem 535566

Hints

- Count the total number of equal pizza slices. - Count the shaded and unshaded slices. - The numerator tells how many slices are selected, and the denominator tells how many equal slices make the whole. - All the slices together make one whole pizza.

Solution

1. Four of the \(10\) slices have pepperoni, so \(10 - 4 = 6\) slices have only cheese. 2. The pepperoni fraction is \(\frac{4}{10}\). 3. The cheese-only fraction is \(\frac{6}{10}\). 4. The two fractions combine to make the whole: \(\frac{4}{10} + \frac{6}{10} = \frac{10}{10} = 1\).

Answer

a) \(6\) slices b) \(\frac{4}{10}\) c) \(\frac{6}{10}\) d) \(\frac{4}{10}\) and \(\frac{6}{10}\)
5357833
Look at each figure or group. What fraction is shaded? Write each answer as a fraction.
Figure for problem 535783

Hints

- First count how many equal parts make the whole. - Then count how many of those parts are shaded. - Does the total number of parts go in the numerator or denominator? - The numerator tells how many parts are selected or shaded.

Solution

1. For each part, count the total number of equal parts. This number is the denominator. 2. Count the shaded parts. This number is the numerator. 3. Write the fraction as \(\frac{\text{shaded parts}}{\text{total parts}}\). 4. Results: - a) The circle has \(5\) parts, and \(2\) are shaded: \(\frac{2}{5}\). - b) The grid has \(2 \times 4 = 8\) squares, and \(3\) are shaded: \(\frac{3}{8}\). - c) The bar has \(6\) sections, and \(5\) are shaded: \(\frac{5}{6}\). - d) The group has \(12\) circles, and \(7\) are shaded: \(\frac{7}{12}\).

Answer

a) \(\frac{2}{5}\) b) \(\frac{3}{8}\) c) \(\frac{5}{6}\) d) \(\frac{7}{12}\)
5358673
A rectangle is divided into \(12\) equal squares. Five squares are shaded red. a) What are the numerator and denominator of the fraction that represents the red-shaded part? b) What does the denominator represent in this situation? c) What fraction of the rectangle is not shaded?
Figure for problem 535867

Hints

- The numerator is the top number, and the denominator is the bottom number. - The denominator describes how many equal parts make the whole. - Subtract the shaded squares from the total to find the unshaded squares.

Solution

1. Since \(5\) of \(12\) squares are shaded, the shaded fraction is \(\frac{5}{12}\). 2. The numerator is \(5\), and the denominator is \(12\). 3. The denominator tells the number of equal parts in the whole rectangle. 4. The number of unshaded squares is \(12-5=7\), so the unshaded fraction is \(\frac{7}{12}\).

Answer

a) Numerator: \(5\); denominator: \(12\) b) The denominator represents the \(12\) equal parts in the whole rectangle. c) \(\frac{7}{12}\)
5374123
The left section represents \(18\) dots and is one-fourth of the whole set. How many dots are in the whole set? Explain why multiplying by \(4\) works.
Figure for problem 537412

Hints

- One-fourth means that four equal parts make one whole. - Use the number in one part to find the number in all four parts.

Solution

One-fourth is one of four equal parts. If one part has \(18\) dots, the whole set has four groups of \(18\) dots: \(4 \times 18 = 72\).

Answer

There are \(72\) dots. One-fourth is one of four equal parts, so \(4 \times 18 = 72\).
5381963
Which activity takes up exactly one-half of the pie chart?
Figure for problem 538196

Hints

- Add the slice values to find the whole. - Find one-half of the whole. - Match that value to a slice.

Solution

1. The total is \(12 + 6 + 6 = 24\). 2. One-half of \(24\) is \(24 \div 2 = 12\). 3. Reading has a value of \(12\), so it takes up one-half of the chart.

Answer

Reading takes up exactly one-half of the pie chart.
5381973
The pie chart shows how students get to school. 1) Which way takes up exactly one-half of the pie chart? 2) Which two ways have equal-sized slices?
Figure for problem 538197

Hints

- Add all four values to find the whole. - Find one-half of the whole. - Look for two equal slice values.

Solution

1. The total is \(4 + 8 + 4 + 16 = 32\). 2. One-half of \(32\) is \(16\), so walking takes up one-half of the chart. 3. Train and bike each have a value of \(4\), so their slices are equal.

Answer

1) Walking takes up one-half of the chart. 2) Train and bike have equal-sized slices.
5382073
The pie-chart slices do not show numbers. 1) Which drink takes up one-half of the circle? 2) Which two drinks each take up one-fourth?
Figure for problem 538207

Hints

- Compare the slice sizes. - Look for two equal smaller slices. - Use the whole circle to identify halves and fourths.

Solution

1. The water slice is as large as the other two slices combined, so it takes up one-half of the circle. 2. The juice and milk slices are equal and split the other half into two equal parts. 3. Therefore, juice and milk each take up one-fourth of the circle.

Answer

1) Water takes up one-half. 2) Juice and milk each take up one-fourth.
5358683
A pizza is cut into \(8\) equal slices for a children’s party. Three children each eat one slice. a) What fraction of the pizza has been eaten? b) How many more slices must be eaten for exactly half of the pizza to be gone? c) What fraction of the pizza remains after \(5\) slices have been eaten in all?
Figure for problem 535868

Hints

- Think of the whole pizza as \(8\) equal parts. - Write one half as an equivalent fraction with denominator \(8\). - Subtract the number eaten from \(8\) to find the number remaining.

Solution

1. Three of the \(8\) slices have been eaten, so the eaten fraction is \(\frac{3}{8}\). 2. Half of \(8\) slices is \(4\) slices. Since \(3\) have already been eaten, \(4-3=1\) more slice must be eaten. 3. If \(5\) slices have been eaten, \(8-5=3\) slices remain. The remaining fraction is \(\frac{3}{8}\).

Answer

a) \(\frac{3}{8}\) b) \(1\) more slice c) \(\frac{3}{8}\)

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