Estimation Techniques in Multiplication and Division

This video tutorial covers estimating multiplication and division problems using whole numbers by rounding. It begins with a review of rounding techniques, explaining how to identify the round-off place digit and determine whether to round up or down. The video then demonstrates estimating products and quotients by rounding to the nearest tens, hundreds, thousands, and hundred thousands. It concludes with a practical word problem example, illustrating how to apply these estimation techniques in real-world scenarios.

What is the primary goal of using estimation in multiplication and division?

• To make numbers look bigger

• To simplify calculations by rounding

• To avoid using calculators

• To find the exact answer quickly

When rounding to the nearest hundreds, what should you do if the digit to the right is less than five?

• Replace the round-off digit with zero

• Leave the round-off digit unchanged

• Decrease the round-off digit by one

• Increase the round-off digit by one

In the example of rounding 348 to the nearest tens, what is the rounded number?

• 350

• 370

• 340

• 360

Why is estimation considered a useful technique when precision is not required?

• It eliminates the need for any calculations

• It provides an exact answer

• It reduces the complexity of calculations

• It always results in a smaller number

When estimating the quotient of 820 divided by 20, what is the approximate result?

• 41

• 42

• 40

• 43

In the division example, what is the first step after rounding the numbers?

• Subtract the numbers

• Add the numbers

• Multiply the numbers

• Divide the numbers

How many hundred thousands are there in 740,000 when estimating the quotient?

• 7

• 6

• 9

• 8

In the word problem, what is the rounded cost per CFL light bulb?

• $1.50

• $1

• $2.50

• $2

If you purchase 18 CFL light bulbs at the rounded cost, what is the estimated total cost?

• $38

• $32

• $34

• $36

What is the benefit of rounding the cost of items when shopping?

• To increase the total cost

• To simplify mental calculations

• To avoid using a shopping list

• To make the items cheaper