Name: __________________________________________
Centimeters and Millimeters
Part 1: Complete the table.
centimeters 1 3 12 40 145
millimeters
Part 2: Circle the greater length for each pair.
a. 4 cm 45 mm b. 50 mm 6 cm
c. 800 cm 1,000 mm d. 3,200 mm 340 cm
Part 3: Measure to the nearest centimeter and/or nearest millimeter.
nearest cm = ___________________ nearest mm = ___________________
nearest cm = ___________________ nearest mm = ___________________
Super Teacher Worksheets - www.superteacherworksheets.com
Part 4: Measure the line segments.
Find the length of line segment g to the nearest centimeter. _________________
Find the length of line segment h to the nearest centimeter. _________________
Find the length of line segment i to the nearest millimeter. _________________
Part 5: Choose the best estimate to answer each question.
About how tall is a plastic water bottle?
a. 20 centimeters b. 20 millimeters
c. 200 centimeters d. 2,000 millimeters
About how tall is a cereal box?
a. 300 millimeters b. 300 centimeters
c. 3 centimeters d. 3,000 millimeters
About how tall is a can of soup?
a. 12 millimeters b. 120 centimeters
c. 40 millimeters d. 12 centimeters
Part 6: Word Problems
Arthur's pencil was 14 centimeters long.
How many millimeters long was his pencil? _________________
Arthur just sharpened his pencil and now
it is 10 mm smaller. How long is his pencil
now? _________________
Samantha has a AA battery that is 51mm
long. About how many centimeters long is it? _________________
Super Teacher Worksheets - www.superteacherworksheets.com
ANSWER KEY
Centimeters and Millimeters
Part 1: Complete the table.
centimeters 1 3 12 40 145
millimeters 10 30 120 400 1,450
Part 2: Circle the greater length for each pair.
a. 4 cm 45 mm b. 50 mm 6 cm
c. 800 cm 1,000 mm d. 3,200 mm 340 cm
Part 3: Measure to the nearest centimeter and/or nearest millimeter.
nearest cm = 7cm nearest mm = 68 mm
nearest cm = 3cm nearest mm = 33mm
Super Teacher Worksheets - www.superteacherworksheets.com
Part 4: Measure the line segments.
Find the length of line segment g to the nearest centimeter. 6 cm
Find the length of line segment h to the nearest centimeter. 5 cm
Find the length of line segment i to the nearest millimeter. 30 mm
Part 5: Choose the best estimate to answer each question.
About how tall is a plastic water bottle? a
a. 20 centimeters b. 20 millimeters
c. 200 centimeters d. 2,000 millimeters
About how tall is a cereal box? a
a. 300 millimeters b. 300 centimeters
c. 3 centimeters d. 3,000 millimeters
About how tall is a can of soup? d
a. 12 millimeters b. 120 centimeters
c. 40 millimeters d. 12 centimeters
Part 6: Word Problems
Arthur's pencil was 14 centimeters long.
How many millimeters long was his pencil? 140 mm
Arthur just sharpened his pencil and now
it is 10 mm smaller. How long is his pencil
now? 130 mm or 13 cm
Samantha has a AA battery that is 51mm
long. About how many centimeters long is it? 5 cm
Super Teacher Worksheets - www.superteacherworksheets.com
