Topic 3 Fluently Multiply Multi-Digit Whole Numbers

Dr. Peterson works 178 hours each month. How many hours does she work in a year?

• 2000

• 2136

• 3000

• 2200

Answer explanation

The question asks how many hours Dr. Peterson works in a year, given that she works 178 hours each month. To find the answer, we need to multiply the monthly hours by the number of months in a year. So, 178 hours/month * 12 months/year = 2136 hours/year. Therefore, the correct answer is 2136 hours.

A banana contains 105 calories. Last week, the kids ate a total of 14 bananas. How many calories does this represent?

Answer explanation

The question asks about the total calories from 14 bananas. Since one banana contains 105 calories, we can find the total by multiplying 105 by 14. This gives us 1470. Therefore, the correct answer is '1,470'.

At a warehouse, 127 delivery trucks were loaded with 48 packages on each truck. What is the total number of packages on these 127 trucks?

Answer explanation

The question asks for the total number of packages on 127 trucks, with each truck carrying 48 packages. To find the total, we multiply the number of trucks by the number of packages each truck carries. So, 127 trucks times 48 packages equals 6096. Therefore, the correct answer is '6096'.

Is this equation correct? Choose the correct explanation.

5.6 x 10³ = 560

• Incorrect. The product should have 3 zeros.

• Correct. The product should have one zero.

• Incorrect. The product should have 0 zeros.

• Incorrect. The product should have 2 zeros.

Answer explanation

The equation 5.6 x 10^3 = 560 is incorrect. The correct product should have 2 zeros, making the correct equation 5.6 x 10^3 = 5600. The given options provided various numbers of zeros, but the correct explanation is that the product should have 2 zeros.

There are 36 large fish tanks at the zoo. Each tank holds 205 gallons of water.

How many gallons of water should it take to fill all of the tanks?

Answer explanation

To find the total gallons of water needed to fill all the tanks, we need to multiply the number of tanks (36) by the amount of water each tank holds (205 gallons). So, 36 * 205 = 7,380 gallons. Therefore, the correct answer is 7,380.

Kai ordered 1,012 baseball cards. Sharon ordered 5 times as many cards as Kai. How many cards did Sharon order?

Answer explanation

To find out how many cards Sharon ordered, we need to multiply the number of cards Kai ordered (1,012) by 5. So, 1,012 * 5 = 5,060. Therefore, Sharon ordered 5,060 cards.

289 x 16 =

Answer explanation

To solve the question, we need to multiply 289 by 16. The correct answer is 4,624, which is the product of the given numbers. Therefore, the correct choice is '4,624'.

12 x 10⁰ =

• 1,200

• 120

• 12

• 12,000

Answer explanation

The question asks for the product of 12 and 10 raised to the power of 0. Any non-zero number raised to the power of 0 is equal to 1. Therefore, 12 x 10^0 = 12 x 1 = 12, which is the correct choice.

12 x 100

• 1,200

• 120

• 12

• 12,000

Answer explanation

The question asks to multiply 12 by 100. To do this, simply add two zeros to the end of 12, resulting in 1,200. This is the correct choice among the given options.

12 x 10³ =

• 1,200

• 120

• 12

• 12,000

Answer explanation

To solve the question, we need to multiply 12 by 10 raised to the power of 3. The expression can be written as 12 x 10^3. When we calculate this, we get 12 x 1000 = 12,000. Therefore, the correct choice is 12,000.