Measure lengths with uniform units, compare lengths and spot gaps or overlaps.
Example 1
The equal-sized blocks touch end−to−end. How many blocks long is row A?
Equal block unitsShow worked answer
Answer: 7
- Count every whole block once.
- The row is 7 blocks long.
Example 2
These equal blocks overlap each other. Why is this not a correct length measurement?
Equal block unitsShow worked answer
Answer: The units must touch end−to−end.
- A length measure must cover the length completely.
- Equal units must be end−to−end with no gaps or overlaps.
Example 3
A ribbon is 6 long blocks long. Each long block is as long as 2 short blocks. How many short blocks measure the ribbon?
Show worked answer
Answer: 12
- Replace each long block with 2 short blocks.
- 6 pairs of short blocks make 12 short blocks.