October 16, 2024

October 16, 2024

Grade 3 Mathematics

Unit 5: Two-Step Addition and Subtraction Problem Solving

Lesson 6: Represent and Solve Addition and Subtraction Problems

LO: SWBAT represent or solve two-step addition
and subtraction problems.

DOL: Given a set of problems, students will
correctly represent or solve two-step addition
and subtraction problems in a least 4 out of 5
problems.

MATH. 3.5 (A) represent one‐ and two‐step problems involving addition and subtraction of whole numbers to 1,000 using pictorial models, number lines, and
equations.

MATH 3.4 (A) solve with fluency one‐step and two‐step problems involving addition and subtraction within 1,000 using strategies based on place value,
properties of operations, and the relationship between addition and subtraction

2

Academic Vocabulary

3

Sum

Difference

Equation

Strip Diagram

Unknown Term

15 + 20 = 35

35 – 15 = 20

35 – 15 = 20

35

15

?

15 + = 35

Sprint: Add by Eight

Timer Vector by Vecteezy.com

4

Practice

7

In the month of October, Adalie, Ahni'ka, and Austin ran a total of 527 laps
around a park.

Adalie

147

Ahni'ka

?

Austin

218

Student

Laps

How many laps did Ahni'ka run?

A.

365

B.

162

C.

309

D.

71

City summer park Vector by Vecteezy.com

Draw

Draw a strip diagram based on the story and table.

Dropdown

Ahni'ka ran​

Select answer

laps.

Practice

8

Aubri had $317 in her banking account.

●On Monday she put $65 more into his bank account.

●On Tuesday she took out $85 to buy a pair of jeans.

Which equation can be used to find the amount of money in Aubri's bank account after buying a pair of jeans?

A.

317 + 65 – 85 =

B.

317 – 65 – 85 =

C.

317 – 65 + 85 =

D.

317 + 65 + 85 =

Money Vector by Vecteezy.com

Multiple Choice

Select the correction based on the story

• 317 + 65 - 85 = ?

• 317 - 65 - 85 = ?

• 317 - 65 + 85 = ?

• 317 + 65 + 85 = ?

Practice

9

There were 375 people at a the zoo . After 92 people left early, 69 more
people arrived.

How many people are at the zoo now?

Record your answer in the space provided.

1

2

3

4

5

6

7

8

9

0

.

x

Museum by Dominic Flamini from Pixabay

Math Response

There were 375 people at a museum. After 92 people left early, 69 more people arrived. How many people are at the museum now? Record your answer in the space provided.

Type answer here

Correct Answer: 352

Deg^°

Rad

Practice

10

Anyia saved $96 from her allowance. She earned $47 more doing chores, but
then spent $28 on a new journal.

How much money does Anyia have left?

Choose the correct answer from the drop-down menu to complete the statement.

Anyia has dollars left.

(Select)

143

75

68

115

Money Vector by Vecteezy.com

Dropdown

Anyia has ​

Select answer

dollars left.

Practice

11

March has 67 baseball cards and 89 basketball cards. He gave 44 cards to Luis.

Which equation can be used to find the number of cards Marco has now?

Select TWO correct answers.

A.

67 + 89 + 44 =

B.

67 + 89 – 44 =

C.

67 – 89 + 44 =

D.

89 + 44 – 67 =

E.

89 + 67 – 44 =

Set of four sports card Pro Vector by Vcteezy.com

Multiple Select

Marco has 67 baseball cards and 89 basketball cards. He gave 44 cards to Luis. Which equation can be used to find the number of cards Marco has now? 

Select TWO correct answers.

• A

• B

• C

• D

• E

At the start of the birthday party, Caiden placed 395 egg rolls on trays. The
children at the party ate 150 egg rolls, and the adults ate 108 egg rolls.

How many egg rolls were left at the end of the party?

Draw a strip diagram.

Write an equation to solve the
story problem.

Solve.

395

150

108

?

395 – 150 – 108 =

At the end of the party ______ egg rolls were left.
137

150
395

–

245

108
245

–

137

315

12

13

Benji borrowed $500 from his sister. He will pay his sister $95 on Friday and $57 on
Saturday. The remaining amount will be paid next week.

How much money will Benji pay his sister next week?

Draw a strip diagram.

Write an equation to solve the
story problem.

Solve.

500

95

57

?

500 – 95 – 57 =

Benji will pay his sister _______ next week.
$348

95
500

–

405

57
405

–

348

There are 142 flowers in Kimora's garden. Of the flowers, 61 are roses, and 21 are
sunflowers, and the rest are carnations.

How many of the flowers are carnations?

Draw a strip diagram.

Write an equation to solve the
story problem.

Solve.

142

61

21

?

142 – 61 – 21 =

There are _____ carnations in Kimora's garden.
60

61
142

–

81

21
81

–

60

140

14

Practice

15

Recap

Lailani represented the following problem using an equation. Do you agree with her equation?

Aiden had 96 marbles. He lost 35 of them but then found 52 more in his closet. How
many marbles does Jack have now?

I ________ with June's equation because _____________.
(agree/disagree)

96 – 35 + 52 =

A sticker template with marble balls Vector by Vecteezy.com

Essential Question Debrief

16

Image by OpenClipart-Vectors from Pixabay

I can use a strip diagram to solve
two-step problems by…
How can you use strip
diagrams to solve
two-step problems?

17

Demonstration of Learning

DOL:Given a set of
problems, students
will correctly
represent or solve
two-step addition
and subtraction
problems in a least 4
out of 5 problems.

Learner Slides

18

Learner Slides