Estimating Quotients and Compatible Numbers

This lesson focuses on estimating quotients using rounding and compatible numbers. It introduces key vocabulary such as dividend, divisor, quotient, and compatible numbers. The lesson includes examples and practice problems to demonstrate how to use compatible numbers for estimation. Students are guided through solving both numerical and word problems, emphasizing mental math and estimation strategies. The lesson concludes with a challenge problem to reinforce the concepts learned.

What is the primary goal of lesson 4-2?

• To solve complex algebraic equations

• To memorize multiplication tables

• To estimate quotients using rounding and compatible numbers

• To learn advanced division techniques

Which term describes the number being divided in a division problem?

• Divisor

• Quotient

• Dividend

• Compatible number

What is a compatible number?

• A number that is difficult to divide

• A number that can easily be divided using mental math

• A number that is always even

• A number that is always a multiple of 10

Which of the following is NOT a vocabulary term introduced in this lesson?

• Quotient

• Divisor

• Factor

• Dividend

In the example of 627 divided by 9, what compatible number is used for estimation?

• 600

• 630

• 650

• 620

Which strategy involves changing numbers to make mental math easier?

• Compatible numbers

• Multiplication

• Rounding

• Long division

What is the purpose of underlining digits in the compatible number strategy?

• To mark numbers to be ignored

• To identify numbers to be changed

• To indicate the final answer

• To highlight the largest number

What is the estimated quotient of 627 divided by 9 using mental math?

• 75

• 60

• 65

• 70

What is the estimated quotient of 538 divided by 6 using compatible numbers?

• 90

• 85

• 95

• 80

What is the estimated quotient of 538 divided by 6 using rounding?

• 95

• 80

• 85

• 90