2-min Warm-up — Circle the correct answer.
Which is LONGER?
1 inch / 1 centimeter
Measuring the same pencil, which number will be BIGGER?
inches / centimeters
Measure the SAME line two different ways: first in inches, then in centimeters.
Line A
In inches: in In centimeters: about cm
Line B
In inches: in In centimeters: about cm
Hint: 1 inch is about 2 and a half centimeters.
Number Talk — Answer WITHOUT measuring. Explain your thinking.
You measure a book in inches, then in centimeters. Which measurement gives a BIGGER number? Why?
My thinking:
Sam says his desk is "3 long." What is wrong with his answer?
My thinking:
Circle the better unit for measuring each object.
an ant
centimeters / inches (small) or feet/meters (big)
your bed
centimeters / inches (small) or feet/meters (big)
a paper clip
centimeters / inches (small) or feet/meters (big)
the classroom door
centimeters / inches (small) or feet/meters (big)
Estimate! Write your best guess. Then find the real object and measure it if you can.
your pencil
Estimate: inches Measured: inches
your hand span
Estimate: cm Measured: cm
a spoon
Estimate: inches Measured: inches
your shoe
Estimate: cm Measured: cm