Estimating Products of Fractions and Decimals

Mr. Bickford introduces Chapter 4, Lesson 1, focusing on estimating the products of fractions. The lesson covers three main strategies: estimating the product of a fraction and a whole number, estimating the product of two fractions, and estimating the product of mixed numbers. Each strategy involves rounding and using models to simplify calculations. The lesson concludes with a hidden treasure problem to reinforce the concepts learned.

What does the term 'estimate' imply in the context of this lesson?

• Getting an approximate value

• Solving unrelated problems

• Finding the exact answer

• Ignoring the problem

What is the first step in estimating 2/5 of 11?

• Add 5 to 11

• Divide 11 by 5

• Find the closest multiple of 5 to 11

• Multiply directly

How do you determine the closest multiple of 5 to 11?

• By adding 5 repeatedly

• By subtracting 5 from 11

• By skip counting by 5s

• By dividing 11 by 5

What is the estimated product of 2/5 of 11?

• 6

• 4

• 3

• 5

What is the strategy for estimating the product of two fractions?

• Round each fraction to the nearest whole number

• Multiply directly

• Round each fraction to 0, 1/2, or 1

• Add the fractions

How would you round 5/8 for estimation purposes?

• To 3/4

• To 1

• To 1/2

• To 0

What is the estimated product of 5/8 times 9/10?

• 3/4

• 2

• 1

• 1/2

What is the strategy for estimating the product of mixed numbers?

• Add the mixed numbers

• Round each to the nearest whole number

• Multiply directly

• Round each to 0, 1/2, or 1

What is the estimated product of 14 7/8 times 6 1/8?

• 80

• 90

• 100

• 70

What is the hidden treasure problem about?

• Estimating the product of two fractions

• Estimating a fraction of a whole number

• Estimating the product of mixed numbers

• Multiplying decimals