Rounding and Estimating Products

The video tutorial teaches how to estimate the products of two-digit numbers by rounding each factor to the nearest ten and then multiplying the rounded numbers. Three examples are provided: 23 times 78, 49 times 31, and 54 times 73. In each case, the factors are rounded to the nearest ten, multiplied, and the appropriate number of zeros are added to the result to get an estimated product.

What is the first step in estimating the product of two-digit numbers?

• Subtract the smaller number from the larger one

• Add the numbers together

• Round each number to the nearest ten

• Multiply the numbers directly

When rounding 23 to the nearest ten, what is the result?

• 30

• 25

• 20

• 23

After rounding 78 to the nearest ten, what number do you get?

• 78

• 70

• 80

• 75

What is the estimated product of 23 and 78 after rounding?

• 1600

• 1800

• 1500

• 1700

How do you determine the number of zeros to add in the estimated product?

• No zeros are added

• Count the zeros in the original numbers

• Count the zeros in the rounded numbers

• Add one zero for each digit

What is 49 rounded to the nearest ten?

• 50

• 45

• 49

• 40

What is 31 rounded to the nearest ten?

• 40

• 30

• 31

• 35

What is the estimated product of 49 and 31 after rounding?

• 1000

• 1500

• 2000

• 100

What is 54 rounded to the nearest ten?

• 54

• 55

• 60

• 50

What is 73 rounded to the nearest ten?

• 70

• 80

• 75

• 73