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How do you find out how many lollipops Jack and Jill have using an equation with a letter representing
Jill’s lollipops?
Jack has 28 lollipops. Jill has 12 fewer. How many lollipops do they have in all?
In this lesson you will learn to solve two step story problems by using letters to represent
unknown quantities in equations.
Let’s ReviewLet’s Review
read
who
what
draw
re-read
compute
answer
Let’s ReviewLet’s Review
28
28
12 ?Jack and Jill have 44 lollipops in all.
28 - 12 = 16
16 + 28 = 44
Jack has 28 lollipops. Jill has 12 fewer. How many lollipops do
they have in all?
Let’s ReviewA Common Mistake
Not using the answer to the first of a two part story in the second part!
Let’s ReviewCore Lesson
Jack has 28 lollipops. Jill has 12 fewer. How many do they have in all?
read
who
what Jack 28
Jill 28 - 12 = ?
The ? can be named L to represent the lollipops
This is called a variable.
Let’s ReviewCore Lesson
Jack has 28 lollipops. Jill has 12 fewer. How many do they have in all?
read
who
what Jack 28
Jill 28 - 12 = Lcompute
28 - 12 = 1 6
Let’s ReviewCore Lesson
Jack has 28 lollipops. Jill has 12 less. How many do they have in all?
Jack 28 + Jill 16re-read
compute
answer
28 + 16 = 44
Jack and Jill have 44 lollipops in all.
Let’s ReviewCore Lesson Zach wants to ride his bike 50 miles. He rides 5 miles each day. After 7 days how many miles does he have left?
read
who
whatZach’s goal = 50 miles
Zach road 7 days 5 miles each
7 x 5= M
compute
7 x 5= 35
Let’s ReviewCore Lesson
7 X 5 =35 miles so far
50 - 35 = M
re-read
Zach wants to ride his bike 50 miles. He rides 5 miles each day. After 7 days how many
miles does he have left?
compute
Zach has 15 miles left to reach his goal.
answer
50 - 35 = 15
In this lesson you have learned to solve two step story
problems by using letters to represent unknown quantities
in equations.
Let’s ReviewGuided Practice
At the beach 3 kids found 8 sand dollars each. Mom found 4 sand dollars. How many sand dollars did the family find?
What: 3 kids 8 sand dollars each Mom has 4 sand dollars
Let’s ReviewGuided Practice
What: 3 kids 8 sand dollars each Mom has 4 sand dollars
Let’s ReviewExtension Activities
Work with a partner to write multi-step story problems.
1. Write one with addition and subtraction.2. Write one with multiplication and addition.3. Write one with multiplication and subtraction.4. Write one with division and subtraction.
Solve your friend’s story problems.
• Show your work.• Use letters for the unknown.• Follow the order of operations.• Compare and discuss your work with a friend.
Let’s ReviewExtension Activities
Challenge…write a story problem that includes multiplication and division! Try it to prove your answer. Ask a friend to try. Discuss and compare your strategies and solutions.
Let’s ReviewQuick Quiz
Select the equation that matches how many popsicles we have.A) 80 + 36 + N = 24B) 80 + 36 - 24 = NC) 36 + 24 + N = 80D) N - 80 + 36 = 24
80 people are coming to the picnic. We have 36 red popsicle. We have 24 grape popsicles. How many more do we need?