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?