1. Sum of Parts
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2. Mass: Weight: The amount of matter that makes up an object.
The amount of gravitational pull on an object.
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3. Let’s think about it… Space Earth On Earth we have gravity…
So, this ball has a…
Mass: 10 grams
Weight: 2 pounds
In space there is NO gravity…
So, this ball has a…
Mass: 10 grams
Weight: 0 pounds
If the pink gorilla eats watermelon every night, how much watermelons does he eat?
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4. What about this ball?
When there is no gravity… The weight_____________________
The mass _______________________
Gravity
Mass: 20 grams
Weight: 4 pounds
No Gravity
Mass: 20 grams
Weight: 0 pounds
If the pink gorilla eats watermelon every night, how much watermelons does he eat?
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5. Let’s think about astronauts
On Earth (GRAVITY)
Astronaut Neil Armstrong:
Mass: grams
Weight: 200 pounds
In space (NO GRAVITY)
Astronaut: Neil Armstrong
Mass:
Weight:
1500 grams
0 pounds
Why does his mass stay the same, but his weight change?
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6. Look at this house…what are the different parts?
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7. Look at this house again…
What are the different parts?
If the pink gorilla eats watermelon every night, how much watermelons does he eat?
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8. Each separate part has a mass…
What is the total mass of the door and knob?
15 grams
Both windows?
20 grams
The total house?
70 grams
20 grams
15 grams
10 grams
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9. The house only has one window…
What is the total
mass now?
60 grams
15 grams
10 grams
10 grams
20 grams
5 grams
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10. Many objects…
Have parts that work together. Each of those parts has mass. The total object also has mass.
Think-pair-share: what are some objects that have different parts?

11. Let’s try another one… What are the parts of the cheeseburger?
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12. What is the total mass of the cheeseburger?
56 grams
12 grams
5 grams
5 grams
6 grams
7grams
10 grams
11 grams
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13. Maura put 100 g potting soil, 50 g fertilizer, and 30 g of seeds into a pot that has a mass of 300 g. What is the total mass of the flower pot?

14. Sarah and Jose are making lemonade
Sarah and Jose are making lemonade. They are using the following ingredients:
Water: 35 grams
4 Lemons: 10 grams each
Sugar: 24 grams
Ice: 20 grams
Pitcher: 50 grams
What is the total mass of the lemonade?
169 grams
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15. They decided the lemonade was too sweet, so they added 3 more lemons
They decided the lemonade was too sweet, so they added 3 more lemons. Now what is the total mass?
Water: 35 grams
4 Lemons: 10 grams each
Sugar: 24 grams
Ice: 20 grams
Pitcher: 50 grams
What is the total mass of the lemonade?
199 grams
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16. They were thirsty and drank 4 glasses of lemonade
They were thirsty and drank 4 glasses of lemonade. Each glass was 15 grams.
How many grams of lemonade are left in the pitcher?
139 grams
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17. Ms. Carter’s class has a recess bag filled with toys. It includes…
Soccer Ball: 24 grams
Basketball: 40 grams
Frisbee: 12 grams
Football: 32 grams
Bag: 10 grams
What is the total mass of the recess bag?
118 grams
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18. Sadly, the football got lost.
Soccer Ball: 24 grams
Basketball: 40 grams
Frisbee: 12 grams
Football: 32 grams
Bag: 10 grams
What is the NEW total mass of the recess bag?
86 grams
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19. Jennifer is hungry, so she decides to make a sandwich:
2 slices of bread: 15 grams each
1 slice of cheese: 12 grams
Turkey: 22 grams
2 tomatoes: 10 grams each
1 piece of lettuce: 7 grams
What is the total mass of the sandwich?
91 grams
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20. Jennifer ate four bites of this sandwich. Each bite was 6 grams.
How much of her sandwich was left?
If the pink gorilla eats watermelon every night, how much watermelons does he eat?
67 grams
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21. What is the total mass of this block tower?
The tower collapsed. In pieces, what is the total mass of this block tower?
25 grams
5 grams
Still 25 grams
5 grams
5 grams
5 grams
5 grams
5 grams
5 grams
5 grams
5 grams
5 grams
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22. Molly stirs 20 grams of salt into 60 grams of water.
What will happen to the mass of the water as the salt is added?
The mass will increase to 80 grams
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23. He cut the brownies into 14 equal pieces.
Mark made a batch of brownies. The entire pan of brownies has a mass of 350 grams.
He cut the brownies into 14 equal pieces.
What is the mass of each brownie?
25 grams
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24. What is the total mass of her tower?
Maria decided to build a tower using 20 blocks. Each block has a mass of 7 grams.
What is the total mass of her tower?
140 grams
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25. Does the mass of an object equal the sum of its parts?
YES!
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26. Write your own mass is the sum of parts problem!