All the solutions provided in McGraw Hill My Math Grade 3 Answer Key PDF Chapter 11 Lesson 3 Estimate and Measure Mass will give you a clear idea of the concepts.
McGraw-Hill My Math Grade 3 Answer Key Chapter 11 Lesson 3 Estimate and Measure Mass
Mass is the amount of matter, or material in an object. One metric unit of mass is the kilogram (kg). These are items that have a mass of about 1 kilogram.
Measure It
What does 1 kilogram feel like?
1. Find three objects and estimate whether each feels less than, about, or more than 1 kilogram. Write the name of the object and your estimate. An example is shown.
Answer:
The mass of the baseball is less than a kilogram.
The mass of 400 pennies is more than a kilogram.
The mass of a dictionary is more than a kilogram.
2. Place 8 rolls of pennies, on one side of the 4 bucket balance. Check each estimate by placing one object on the other side of the balance. Record your results in the table.
Answer:
8 rolls of pennies is equal to 400 pennies which is greater than a kilogram.
Try It
What does 1 gram feel like?
These are items that have a mass of about 1 gram.
1. Find three objects that you think would best be measured in grams. Write the name of the object and your estimate. An example is shown.
2. Place a base-ten cube on one side of the bucket balance. Check each estimate by placing one object on the other side of the balance. Record your results in the table.
Answer:
The mass of dollar bill is equal to 1 gram.
The mass of base ten cube is greater than 1 gram.
The mass of Base ten cube is greater than mass of a dollar pin.
Talk About It
Question 1.
What characteristics were shared by the objects that you chose to measure the mass of in grams?
Answer: The mass of each object is shared. Comparing the mass of the objects in the bucket balance we can measure the mass in grams.
Question 2.
Mathematical PRACTICE Draw a Conclusion Does a large object always have a greater mass than a small object? Explain.
Answer: Large objects always have a greater mass than small object.
Practice It
Circle the better unit to measure each mass.
Question 3.
toothbrush
gram
kilogram
Answer: The better unit to measure the mass of the toothbrush is the gram.
Question 4.
television
gram
kilogram
Answer: The better unit to measure the mass of the television is a kilogram.
Question 5.
shovel
gram
kilogram
Answer: The better unit to measure the mass of the shovel is a gram.
Question 6.
teddy bear
gram
kilogram
Answer: The better unit to measure the mass of the teddy bear is a kilogram.
Question 7.
pair of sunglasses
gram
kilogram
Answer: The better unit to measure the mass of the pair of sunglasses is a gram.
Question 8.
lawn mower
gram
kilogram
Answer: The better unit to measure the mass of the lawn mower is a kilogram.
Circle the better estimate for each mass.
Question 9.
5 g
5 kg
Answer: The better estimated mass of the watermelon is 5 kg.
Question 10.
50 g
5,000 g
Answer: The better estimated mass of the hairbrush is 50 g.
Question 11.
4 g
4 kg
Answer: The better estimated mass of the fish is 4 kg.
Question 12.
15 g
15 kg
Answer: The better estimated mass of the cycle is 15 kg.
Question 13.
900 g
900 kg
Answer: The better estimated mass of the car is 900 kg.
Question 14.
5 kg
5 g
Answer: The better estimated mass of the coin is 5 g.
Apply It
Question 15.
A store in the mall sells fresh baked pretzels. Would it be more reasonable to measure the mass of a baked pretzel in grams or kilograms? Explain.
Answer: It is reasonable to measure the mass of a baked pretzel in grams than kilograms.
Question 16.
Mathematical PRACTICE Model Math Mrs. Charles grows squash in her garden. Which would be a more reasonable estimate for the mass of a squash; 500 grams or 500 kilograms? Explain.
Answer:
Given,
Mrs. Charles grows squash in her garden.
It is reasonable to estimate the mass of a squash in 500 grams than 500 kilograms.
Question 17.
Mathematical PRACTICE Reason A bag of potatoes has a mass of about 3 kilograms. Name two other items that have about the same mass. Explain your reasoning.
Answer:
The mass of onions will be similar to the weight of potatoes.
The mass of watermelon is similar to 3 kgs mass of potatoes.
Question 18.
Mathematical PRACTICE Find the Error Jack held an apple in his hand. He said, “This apple feels like it has a mass of 100 kilograms.” Explain his error. What should Jack have said?
Answer: The mass of an apple will be in grams not in kilograms. So, Jack should have said, “This apple feels like it has a mass of 100 grams.”
Write About It
Question 19.
What is different about the items you measured in grams and those you measured in kilograms?
Answer: The grams are used to measure the small objects and kilograms are used to measure the big objects.
McGraw Hill My Math Grade 3 Chapter 11 Lesson 3 My Homework Answer Key
Practice
Circle the better unit to measure each mass.
Question 1.
bowling ball
gram
kilogram
Answer: The better unit to measure the weight of the bowling ball is the kilogram.
Question 2.
zebra
gram
kilogram
Answer: The better unit to measure the weight of the zebra is the kilogram.
Question 3.
cell phone
gram
kilogram
Answer: The better unit to measure the weight of the cell phone is a gram.
Question 4.
laptop computer
gram
kilogram
Answer: The better unit to measure the weight of the laptop computer is the kilogram.
Question 5.
pair of socks
gram
kilogram
Answer: The better unit to measure the weight of the pair of socks is a gram.
Question 6.
a marble
gram
kilogram
Answer: The better unit to measure the weight of the marble is a gram.
Circle the better estimate for each mass.
Question 7.
4 grams
4 kilograms
Answer: The mass of the object is 4 grams.
Question 8.
2 grams
2 kilograms
Answer: The mass of the object is 2 grams.
Question 9.
20 grams
20 kilograms
Answer: The mass of the object is 20 kilograms.
Question 10.
3 grams
3 kilograms
Answer: The mass of the object is 3 kilograms.
Problem Solving
Question 11.
Mathematical PRACTICE Use Mental Math Dylan is making a casserole that serves 4 people. The recipe calls for shredded cheese. Would it be more reasonable for Dylan to measure the mass of the cheese in grams or kilograms? Explain.
Answer:
It is more reasonable to measure the cheese in grams. The recipe serves only 4 people, so a kilogram or more would be too much cheese.
Question 12.
Paulette needs help moving her file cabinet. Is 40 grams or 40 kilograms a more reasonable estimate for the file cabinet’s mass? Explain.
Answer:
40 kilograms is a more reasonable estimate than 40 grams. Paulette would not need help moving something with a mass of only 40 grams.
Vocabulary Check
Choose the correct word to complete each sentence.
mass
gram
kilogram
Question 13.
The amount of matter an object has is its ________________.
Answer: The amount of matter of an object has is its mass.
Question 14.
A baseball bat has a mass of about 1 _______________.
Answer: A baseball bat has a mass of about 1 kilogram.
Question 15.
A penny has a mass of about 1 _______________.
Answer: A penny has a mass of about 1 gram.