Solve the measurement questions in the attached image.

Understand the Problem

The image shows a worksheet with measurement-related problems. The worksheet includes tasks such as finding the length of objects using a ruler, measuring lines, and identifying errors on a ruler.

Answer

The pencil is 12 cm long. The battery is 5 cm long. Line AB is 9 cm long. Line CD is between 3 cm and 4 cm long. The mistakes on the ruler are at 5 cm and 10 cm. The nail is 5 cm long.

Steps to Solve

Find the actual length of the pencil

The pencil starts at 0 cm and ends at 12 cm. Therefore, the length of the pencil is 12 cm.

Find the actual length of the battery

The battery starts at 5 cm and ends at 10 cm. Therefore, the length of the battery is $10 \text{ cm} - 5 \text{ cm} = 5 \text{ cm}$.

Measure the length of line AB

Line AB starts at A and ends at B. The length of AB is 9 cm.

Measure the length of line CD

Line CD starts at C and ends at D. The length of CD is between 3 cm and 4 cm.

Identify the mistakes on the ruler

The ruler has two mistakes: the 5 cm mark and the 10 cm mark are in the wrong place, and the correct positions are 6 cm and 11 cm respectively.

Find the length of the nail

The nail starts at 0 cm and ends at the 5 cm mark. Therefore, the nail is 5 cm long.

The pencil is 12 cm long. The length of the battery is 5 cm. The length of line AB is 9 cm. The length of line CD is between 3 cm and 4 cm. The mistakes on the ruler are at 5 cm and 10 cm. The nail is 5 cm long.

More Information

Measuring the lengths of objects using a ruler involves aligning one end of the object with the zero mark on the ruler and then reading the value on the ruler where the other end of the object aligns. Any discrepancies on the ruler should be noted and corrected to ensure accurate measurement.

Tips

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