Estimating with Fractions: Fun Math Challenges for 5th Graders

A recipe calls for 2/3 cup of sugar. If you want to make a half batch, how much sugar will you need? Estimate your answer.

• 2/3 cup of sugar

• 1/2 cup of sugar

• 1/3 cup of sugar

• 1/4 cup of sugar

Liam has 3/4 of a yard of fabric. He uses 1/3 of it for a project. How much fabric does he have left? Estimate the remaining fabric.

• 1/4 yard

• 3/4 yard

• 2/3 yard

• 1/2 yard

A pizza is cut into 8 equal slices. If you eat 3/8 of the pizza, how much pizza is left? Estimate the remaining slices.

• 5 slices

• 2 slices

• 6 slices

• 4 slices

Samantha bought 2.5 pounds of apples. If she uses 1.2 pounds for a pie, how much does she have left? Estimate the weight of the remaining apples.

• 1.0 pounds

• 2.0 pounds

• 1.5 pounds

• 1.3 pounds

A garden has 1/2 of its area planted with tomatoes and 1/4 with cucumbers. What fraction of the garden is not planted? Estimate the unplanted area.

• 3/4

• 1/3

• 1/4

• 1/2

A car travels 3.6 miles per gallon of gas. If it has 10 gallons, how far can it travel? Estimate the total distance.

• 30 miles

• 36 miles

• 50 miles

• 40 miles

A baker uses 1/4 of a cup of flour for each cookie. If she makes 12 cookies, how much flour does she use in total? Estimate the total flour used.

• 3 cups of flour

• 1 cup of flour

• 4 cups of flour

• 2 cups of flour

A class has 15 students, and 2/5 of them are girls. How many girls are in the class? Estimate the number of girls.

• 6

• 10

• 8

• 5

A bottle holds 1.5 liters of juice. If you pour out 0.75 liters, how much juice is left? Estimate the remaining juice.

• 0.5 liters

• 0.75 liters

• 1 liter

• 1.25 liters

A farmer harvested 3/5 of his corn crop. If he had 200 ears of corn, how many ears did he harvest? Estimate the number of ears harvested.

• 120

• 150

• 100

• 80