Estimating Division by Setting up Equations

The video tutorial teaches how to estimate division by setting up equations. It begins with a review of multiplication and division as inverse operations and highlights common mistakes in setting up division equations. The tutorial introduces the use of variables to express unknown numbers in division problems and explains smart rounding for estimation. Through example problems, viewers learn to apply these concepts to estimate division results effectively.

What is the correct multiplicative inverse for the division problem 63 divided by 9?

• 9 times 7 equals 63

• 63 times 7 equals 9

• 7 times 9 equals 63

• 63 times 9 equals 7

When setting up a division problem as an equation, what does the variable 'n' represent?

• A known number

• The divisor

• A mystery number

• The dividend

How do you perform smart rounding for the number 54 in the context of division estimation?

• Round to 45

• Round to 50

• Round to 55

• Round to 60

In the problem 1,560 divided by 11, what is the estimated value of 'n' after smart rounding?

• 160

• 170

• 150

• 140

For the problem of sharing 1,155 cookies among 13 groups, what is the estimated number of cookies per group using smart rounding?

• 100

• 110

• 120

• 130