2-min Warm-up — Perimeter in your head!
Square, sides 5
P =
Square, sides 10
P =
Rectangle 6 and 2
P =
Use your real ruler to measure each line to the nearest inch. Line up the 0 mark with the start!
Estimate First! Measure with paper clips (or your thumb)! FIRST estimate, THEN measure for real.
| Object | My estimate | Actual measure |
|---|---|---|
| This worksheet (long side) | clips | clips |
| Your pencil | clips | clips |
| A book cover | clips | clips |
Were your estimates close? What helped you estimate better each time?
Read carefully. Think about what is happening. Is it an AREA question or a PERIMETER question?
Grandpa is building a fence around his rectangle garden. It is 6 meters long and 4 meters wide. How many meters of fence does he need?
Area or perimeter?
My thinking:
meters
Zoe is covering her rectangle desk with sticky notes. The desk fits 5 rows of 4 notes. How many sticky notes cover the desk?
Area or perimeter?
My thinking:
notes
A picture frame goes around a photo that is 7 units long and 5 units wide. How many units of frame are needed?
Area or perimeter?
My thinking:
units
Number Talk — Explain WITHOUT calculating.
Two gardens have the SAME perimeter of fence. Could one of them still have MORE area inside?
My thinking:
Liam measures his pencil with paper clips and gets 4. Emma measures the SAME pencil with tiny beads and gets 12. Whose pencil measurement is right?
My thinking: