masking tape (blue works best, but any color tape will work)
Go around the house and put masking tape on 10 different items, using different lengths of tape.
For example, use 10inch masking tape on the door, 5 inch masking tape on the side of the table, 7 inch masking tape on the leg of the chair, etc. Make sure you place the tape straight so it can be easily measured. Number the sheet of paper from 1 to 10 and place it on a clip board. Encourage your child to go around the house and find 10 items labeled with masking tape. Then he or she has to write the name of the item and the length of the masking tape on the item. Give them a 12inch ruler to use.
If this is the first time your child is learning to use a ruler, be sure to demonstrate and help out with the activity so they get a clear understanding of how to line up the bottom of the ruler with the bottom of the tape to get an accurate measurement!
Have fun on your scavenger hunt!