Measuring Length — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. A book is 25 cm long. A pencil is 18 cm long. How much longer is the book?
A) 5 cm
B) 6 cm
C) 7 cm
D) 8 cm
25 − 18 = 7. The book is 7 cm longer than the pencil.
2. Which tool is best for measuring the length of a desk?
A) Thermometer
B) Ruler
C) Scale
D) Clock
A ruler is the best tool for measuring the length of a desk. It gives an accurate measurement in inches or centimeters.
3. How many inches are in 2 feet?
A) 12
B) 18
C) 24
D) 36
1 foot = 12 inches, so 2 feet = 2 × 12 = 24 inches.
4. A worm is 4 cm long. A caterpillar is 9 cm long. How long are they together?
A) 11 cm
B) 12 cm
C) 13 cm
D) 14 cm
4 + 9 = 13. Together the worm and caterpillar measure 13 cm.
Part B: Fill in the Blank
Write the correct answer on each line.
1. There are 100 centimeters in one meter.
There are 100 centimeters in 1 meter. Centi- means one hundredth.
2. A door is about 7 feet tall.
A standard door is about 7 feet tall, which is 84 inches.
3. A marker that is 6 inches is shorter than a ruler that is 12 inches.
6 inches is less than 12 inches, so the marker is shorter than the ruler.
4. We start measuring at the zero mark on a ruler.
Always start measuring at the zero mark on a ruler to get an accurate measurement.
5. The length of your arm is about 2 feet.
A child's arm is about 2 feet long, which equals 24 inches.