Measure Mass
Customary Units of Weight
Pound (lb) and ounce (oz) are customary units used when measuring weight.
Measure things that are very light - a paper clip, a key, or a slice of bread - in ounces.
Measure things that are heavy - a bicycle, a chair, or a loaf of bread - in pounds.
Practice
Choose the unit you would use to measure the weight of each: ounces or pounds.
1. 
ounces or pounds ?
2. 
ounces or pounds ?
3. 
ounces or pounds ?
4. 
ounces or pounds ?
5. 
ounces or pounds ?
6. 
ounces or pounds ?
7. 
ounces or pounds ?
8. 
ounces or pounds ?
9. 
ounces or pounds ?
10. refrigerator
ounces or pounds ?
11. cracker
ounces or pounds ?
12. sponge
ounces or pounds ?
13. piano
ounces or pounds ?
Choose the better estimate for each.
14. a puppy
20 ounces or 20 pounds
15. a boot
5 ounces or 500 ounces
16. a bike
217 pounds or 17 pounds
Write in order from the least weight to the greatest weight.
17.
20 oz 1 lb 12 oz
18.
25 oz 50 oz 3 lb
19.
½lb 12 oz 9 oz
Find the missing measure for each.
20.
2 lb = ______ oz
21.
48 oz = ______ lb
22.
1½ lb = ______ oz
Trick Question!
Which is heavier: a pound of flour or a pound of bricks? Explain.
Answers
1. pounds
2. pounds
3. ounces
4. ounces
5. pounds
6. ounces
7. pounds
8. pounds
9. ounces
10. pounds
11. ounces
12. ounces
13. pounds
14. 20 ounces
15. 500 ounces
16. 17 pounds
17. 12 oz, 1 lb, 20 oz
18. 25 oz, 3 lb, 50 oz
19. 1/2 lb, 9 oz, 12 oz
20. 32
21. 3
22. 24
Trick question. Neither-- they both weigh one pound!