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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.