Learning Target: I can estimate the weight of an object using pounds and ounces. Learning Target: I can estimate the weight of an object using pounds and ounces.
Pound (lb) and ounce (oz) are customary units used when measuring weight.
You can measure things that are very light - a paper clip, a key, or a slice of bread - in ounces.
You can measure things that are heavy - a bicycle, a chair, or a loaf of bread - in pounds.
Let's Practice Together
Choose the unit you would use to measure the weight of each: ounces or pounds.
1. 
2. 
3. 
4. 
5. 
6. 
Write in order from the least weight to the greatest weight.
7.
20 oz 1 lb 12 oz
8.
25 oz 50 oz 3 lb
9.
½lb 12 oz 9 oz
Your Turn
Choose the unit you would use to measure the weight of each: ounces or pounds.
10. 
11. 
12. 
13. refrigerator
14. cracker
15. sponge
16. piano
Find the missing measure for each.
17.
2 lb = ______ oz
18.
64 oz = ______ lb
19.
1½ lb = ______ oz
Check for Understanding
Choose the better estimate for each.
1. a puppy
20 ounces or 20 pounds
2. a boot
5 ounces or 500 ounces
3. a bike
217 pounds or 17 pounds
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. 12 oz, 1 lb, 20 oz
8. 25 oz, 3 lb, 50 oz
9. 1/2 lb, 9 oz, 12 oz
10. pounds
11. pounds
12. ounces
13. pounds
14. ounces
15. ounces
16. pounds
17. 32
18. 4
19. 24
Check for Understanding
1. 20 ounces
2. 500 ounces
3. 17 pounds
Trick question. Neither-- they both weigh one pound!