Measuring Lengths — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. We measure length with a ruler.
A ruler is a standard tool used to measure length in inches or centimeters.
2. An inch is a standard unit of measurement.
An inch is a standard unit because it is the same size everywhere, unlike nonstandard units.
3. A crayon is 3 inches long. It measures 3 inches.
The crayon is 3 inches long, so its measurement is 3 inches.
4. There are 12 inches in one foot.
A foot is a standard unit of measurement equal to 12 inches.
5. A pencil is 7 inches long. You measure it with a ruler.
A ruler is the standard tool used to measure length in inches.
6. A glue stick is 4 inches long.
Inches are a standard unit of measurement used with a ruler to measure small objects.
7. A door is about 7 feet tall.
Feet are a standard unit used to measure larger objects like doors.
8. When you use a ruler, you start measuring from the number 0.
You always start measuring from 0 on a ruler to get an accurate measurement.
Part B: True or False
Read each sentence. Circle True or False.
1. An inch is a standard unit of measurement.
True False
True. An inch is a standard unit because it is always the same size no matter who uses it.
2. A ruler helps us measure how long something is.
True False
True. A ruler is a tool designed to measure the length of objects in standard units like inches.
3. A foot is shorter than an inch.
True False
False. A foot equals 12 inches, so a foot is much longer than a single inch.
4. You should start measuring from the end of the ruler, not from zero.
True False
False. You should always start measuring from zero on the ruler to get the correct length.
5. A book that is 9 inches long is longer than one that is 6 inches long.
True False
True. 9 inches is greater than 6 inches, so the 9-inch book is longer.