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P. 152
09Math Balance Unit
2 Solve each word problem. 2. Have students read and solve word
problems and write addition (2a) and
a There are 12 cupcakes in the bag. How many cupcakes do subtraction (2b, 2c) sentences.
you need to put to make 24 cupcakes?
12 24 2a. Use the 4-step method.
12+ =24 Understand the Question
=24-12
=12 Q: What are we trying to find?
A: The number of cupcakes.
Q: How many cupcakes are there?
b There were 25 strawberries on the plate. Jessica ate some A: 12.
strawberries, and 11 strawberries are left now. How many
strawberries did Jessica eat? Q: How many cupcakes do we need?
A: 24.
Plan the Process
25 11 Q: How can we solve it?
25- =11 A: Use that represents the missing
=25-11
=14 number in a sentence.
Solve the Problem
Q: Write an addition sentence.
A: 12 24.
c Ann’s age is the result of the subtraction from her father’s age Look Back
to her mother’s age. Ann’s father is 45 years old, and Ann is
8 years old. How old is Ann’s mother? Q: What is the answer?
A: 12.
45 years 8 years 45- =8
=45-8
=37
9. Math Balance 85
Problem 2: There are 34 marbles. I gave 4 marbles to 34 16
my friend, left 16 for myself and gave the 2A Unit 09 135
rest to my brother. How many marbles
did I give to my brother?
Solution: 34 4 16, 30 16,
30 16, 14
Answer: 14 marbles.
2 Solve each word problem. 2. Have students read and solve word
problems and write addition (2a) and
a There are 12 cupcakes in the bag. How many cupcakes do subtraction (2b, 2c) sentences.
you need to put to make 24 cupcakes?
12 24 2a. Use the 4-step method.
12+ =24 Understand the Question
=24-12
=12 Q: What are we trying to find?
A: The number of cupcakes.
Q: How many cupcakes are there?
b There were 25 strawberries on the plate. Jessica ate some A: 12.
strawberries, and 11 strawberries are left now. How many
strawberries did Jessica eat? Q: How many cupcakes do we need?
A: 24.
Plan the Process
25 11 Q: How can we solve it?
25- =11 A: Use that represents the missing
=25-11
=14 number in a sentence.
Solve the Problem
Q: Write an addition sentence.
A: 12 24.
c Ann’s age is the result of the subtraction from her father’s age Look Back
to her mother’s age. Ann’s father is 45 years old, and Ann is
8 years old. How old is Ann’s mother? Q: What is the answer?
A: 12.
45 years 8 years 45- =8
=45-8
=37
9. Math Balance 85
Problem 2: There are 34 marbles. I gave 4 marbles to 34 16
my friend, left 16 for myself and gave the 2A Unit 09 135
rest to my brother. How many marbles
did I give to my brother?
Solution: 34 4 16, 30 16,
30 16, 14
Answer: 14 marbles.
