Measuring Length with Units
Measure objects using informal units like blocks, hands, or paperclips.
What You Need to Know
Measure objects using informal units like blocks, hands, or paperclips.
Key Concept Diagram
We measure length to find out how long something is
Informal units include blocks, hands, and steps
We line units up end to end with no gaps
More small units fit than big units for the same length
Key Vocabulary
length
how long something is from end to end
unit
one piece used to measure
informal unit
an everyday object used to measure
estimate
a careful guess before measuring
Knowledge Check
Select the correct answer for each question. Click "Check Answer" to see if you are right.
Question 1
A book is 6 blocks long. A pencil case is 4 blocks long. Which is longer?
Question 2
Why do we line units up with no gaps when measuring?
Question 3
Asha measures her desk with her hand. It is 10 hands wide. Ben measures the same desk with his bigger hand. What will Ben count?
Key Concepts Summary
- ●We measure length to find out how long something is
- ●Informal units include blocks, hands, and steps
- ●We line units up end to end with no gaps
- ●More small units fit than big units for the same length