Measuring Length with Models

A pencil is placed next to a ruler. The pencil starts at 0 and ends at 7. What is the length of the pencil in inches?

• 5 inches

• 6 inches

• 7 inches

• 8 inches

Answer explanation

The pencil starts at 0 and ends at 7. To find the length, subtract the starting point from the ending point: 7 - 0 = 7 inches. Therefore, the correct answer is 7 inches.

A crayon measures 4 centimeters long. Which number on the ruler shows where the crayon ends if it starts at 0?

• 2

• 3

• 4

• 5

Answer explanation

The crayon is 4 centimeters long and starts at 0 on the ruler. To find where it ends, you add the length of the crayon to the starting point: 0 + 4 = 4. Therefore, the crayon ends at the 4 mark on the ruler.

What tool would you use to find the length of a book in inches?

• A scale

• A ruler

• A thermometer

• A clock

Answer explanation

A ruler is the appropriate tool to measure the length of a book in inches, as it provides a direct measurement. A scale measures weight, a thermometer measures temperature, and a clock measures time.

A student measures a rope using a ruler. The rope does not start at 0 on the ruler. It starts at 2 inches and ends at 9 inches. What is the length of the rope?

• 9 inches

• 8 inches

• 7 inches

• 6 inches

Answer explanation

To find the length of the rope, subtract the starting point from the ending point: 9 inches - 2 inches = 7 inches. Therefore, the length of the rope is 7 inches.

A book is 15 centimeters long. A pencil is 9 centimeters long. How much longer is the book than the pencil?

• 4 centimeters

• 5 centimeters

• 6 centimeters

• 7 centimeters

Answer explanation

To find how much longer the book is than the pencil, subtract the length of the pencil from the length of the book: 15 cm - 9 cm = 6 cm. Therefore, the book is 6 centimeters longer than the pencil.

A student has a piece of string that is 12 inches long. She cuts off 4 inches. She then measures the remaining string using inch tiles. How many inch tiles will she need to measure the remaining string?

• 6 inch tiles

• 7 inch tiles

• 8 inch tiles

• 9 inch tiles

Answer explanation

The student starts with 12 inches of string and cuts off 4 inches, leaving 12 - 4 = 8 inches. To measure the remaining string, she will need 8 inch tiles, which matches the correct answer.

A student measures three crayons. The red crayon is 8 centimeters, the blue crayon is 11 centimeters, and the green crayon is 6 centimeters. If the student places all three crayons end to end in a straight line, what would be the total length?

• 23 centimeters

• 24 centimeters

• 25 centimeters

• 26 centimeters

Answer explanation

To find the total length of the crayons, add their lengths: 8 cm (red) + 11 cm (blue) + 6 cm (green) = 25 cm. Therefore, the total length is 25 centimeters.

A student measures a piece of ribbon and finds it is 18 centimeters long. She wants to cut it into 3 equal pieces. She uses a ruler to mark where to cut. What should each piece measure, and how can she use the ruler to make sure each piece is the correct length?

• Each piece should be 5 centimeters; mark at 5 and 10 centimeters

• Each piece should be 6 centimeters; mark at 6 and 12 centimeters

• Each piece should be 7 centimeters; mark at 7 and 14 centimeters

• Each piece should be 9 centimeters; mark at 9 and 18 centimeters

Answer explanation

Each piece should be 6 centimeters since 18 divided by 3 equals 6. To ensure accuracy, the student should mark the ribbon at 6 centimeters and then at 12 centimeters before cutting.

What is the measurement of these cubes?

Answer explanation

The measurement of cubes refers to their dimensions, typically expressed as the length of one side. If the side length is known, the measurement can be determined directly.