Transcript Document

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
Review
Let’s
Review
read
who
what
draw
re-read
compute
answer
Let’s
Review
Let’s
Review
Jack has 28 lollipops. Jill has 12
fewer. How many lollipops do
they have in all?
28
28 - 12 = 16
28
12
16 + 28 = 44
?
Jack and Jill have 44
lollipops in all.
A Common
Let’s
Review Mistake
Not using the answer to the first of a
two part story in the second part!
CoreReview
Lesson
Let’s
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.
CoreReview
Lesson
Let’s
Jack has 28 lollipops. Jill has 12 fewer.
How many do they have in all?
read
who
what
compute
Jack 28
Jill 28 - 12 = L
28 - 12 = 1 6
CoreReview
Lesson
Let’s
Jack has 28 lollipops. Jill has 12 less.
How many do they have in all?
re-read
compute
answer
Jack 28
+
Jill 16
28 + 16 = 44
Jack and Jill have 44
lollipops in all.
CoreReview
Lesson
Let’s
Zach wants to ride his
bike 50 miles. He rides 5 miles each day.
After 7 days how many miles does he have
left?
Zach’s goal = 50 miles
what
read
Zach road 7 days
compute
who
5 miles each
7 x 5= M
7 x 5= 35
CoreReview
Lesson
Let’s
Zach wants to ride his bike 50 miles. He rides
5 miles each day. After 7 days how many
miles does he have left?
re-read
compute
answer
7 X 5 =35 miles so far
50 - 35 = M
50 - 35 = 15
Zach has 15 miles left to reach
his goal.
In this lesson you have
learned to solve two step story
problems by using letters to
represent unknown quantities
in equations.
Guided
Practice
Let’s
Review
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
Guided
Practice
Let’s
Review
What: 3 kids 8 sand dollars each
Mom has 4 sand dollars
Extension
Let’s
ReviewActivities
Work with a partner to write multi-step story problems.
1.
2.
3.
4.
Write one with addition and subtraction.
Write one with multiplication and addition.
Write one with multiplication and subtraction.
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.
Extension
Let’s
ReviewActivities
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.
Quick Quiz
Let’s
Review
80 people are coming to the picnic. We have
36 red popsicle. We have 24 grape
popsicles. How many more do we need?
Select the equation that matches how many
popsicles we have.
A) 80 + 36 + N = 24
B) 80 + 36 - 24 = N
C) 36 + 24 + N = 80
D) N - 80 + 36 = 24