Measuring Lengths (Nonstandard & Standard Units) — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. A shoe is about 9 cubes long.
If you snap cubes together along a typical shoe, about nine of them will line up from heel to toe.
2. You need more small units than big units to measure the same object.
Tiny units fit more times along an object than larger ones, so you always count more of them than big units.
3. A door is taller than a chair.
Doors stretch high enough for grown-ups to walk through, while a chair only reaches about your waist.
4. We use a ruler to find how many inches long something is.
Rulers have inch marks printed along the edge, making them the right tool for measuring in inches.
5. If a ribbon is 10 clips and a rope is 15 clips, the rope is longer.
Fifteen clips is more than ten clips, so the rope stretches farther and is the longer one.
6. The number of units from one end to the other is the length.
Length is the word for how far an object reaches from one end to the other when we measure it.
7. A cube is a nonstandard unit you can use to measure.
Cubes are nonstandard because they aren't official measurements like inches, but they all share one size, which lets us count them.
8. A glue stick is about 3 inches long.
A typical glue stick fits across about three inch marks on a ruler, making it roughly three inches in length.
9. When you measure, do not leave gaps between the units.
Empty spaces between units would add extra distance and make the measurement too big, so units must touch.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
inch
→ standard unit
standard unit
cube
→ snap block
snap block
paper clip
→ small fastener unit
small fastener unit
crayon
→ classroom unit
classroom unit
Inches are official standard units, cubes are blocks that snap together, paper clips are small wire fasteners we line up, and crayons are everyday classroom items we can compare.