Freddy had 2 candy bars. He promised his brother that he would give him 1 of his candy bars. How

much will he have left after he gives his brother the amount he

promised?

In this lesson you will learn how to estimate the reasonableness

of answers to word problems with mixed-numbers by using models.

Let’s Review

A model is a picture that represents a fraction.

=12

Let’s Review

A mixed-number is when there is a whole number combined with a fraction.

=212

Core Lesson

Reasonable means to be logical.

Reasonable!

Core Lesson

Freddy had 2 candy bars. He promised his brother that he would give him 1 of his candy bars. How much will he have left after he gives his brother the amount he promised?

1. Calculate 2. Estimate 3. Compare

1

321

61- = 11

6 candy bars

Core Lesson 2. Estimate

13

16

-

13

1candy bars

2

1

0

0

Freddy had 2 candy bars. He promised his brother that he would give him 1 of his candy bars. How much will he have left after he gives his brother the amount he promised?

Core Lesson

3. CompareCalculated Estimated

How did we do?

How did we do?

Our answer is reasonable!

13 candy bars1

11

6 candy bars

A Common Misunderstanding 2. Calculate

candy bars

It does not make sense!

+

Freddy had 2 candy bars. He promised his brother that he would give him 1 of his candy bars. How much will he have left after he gives his brother the amount he promised?

2 1

=C3X

Core Lesson

Louis and his friend Mary planted sunflower seeds in class. Mary's flower grew 3 feet tall and Louis's flower grew 2 feet tall. How tall did both flowers grow altogether?

1. Calculate 2. Estimate 3. Compare

3

2+5 =6 =6 ’

Core Lesson 2. Estimate

+ 23

7

43

feet

Louis and his friend Mary planted sunflower seeds in class. Mary's flower grew 3 feet tall and Louis's flower grew 2 feet tall. How tall did both flowers grow altogether?

Core Lesson 3. Compare

Calculated Estimated How did we do?

How did we do?

Our answer is reasonable!

6 feet 7 feet

In this lesson you have learned how to estimate the

reasonableness of answers to word problems with mixed-numbers by using models.