# Practice Problems for 5.2 and 5.3 - PowerPoint PPT Presentation

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Practice Problems for 5.2 and 5.3. Multiply 3.47 by 2.9. Steps! Take away the decimals. 347 * 29. Use the multiplication algorithm. 347 * 29 = 10063 Count the decimal places! 3.47 has 2 decimal places. 2.9 has 1 decimal place. Add the decimal places. 2 + 1 = 3.

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Practice Problems for 5.2 and 5.3

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## Practice Problems for 5.2 and 5.3

### Multiply 3.47 by 2.9

• Steps!

• Take away the decimals.

• 347 * 29.

• Use the multiplication algorithm.

• 347 * 29 = 10063

• Count the decimal places!

• 3.47 has 2 decimal places.

• 2.9 has 1 decimal place.

• 2 + 1 = 3.

• Move decimal places from the right.

• 10063.0 becomes 10.063

### Multiply 49.9 by 7.35

• Steps!

• Take away the decimals.

• 499 * 735

• Use the multiplication algorithm.

• 499 * 735 = 366765

• Count the decimal places!

• 49.9 has 1 decimal place.

• 7.35 has 2 decimal places.

• 1 + 2 = 3.

• Move decimal places from the right.

• 366765.0 becomes 366.765

### Multiply 6.251 by 52.4466

• Steps!

• Take away the decimals.

• 6251 *524466

• Use the multiplication algorithm.

• 6251 *524466 = 3278436966

• Count the decimal places!

• 6.251 has 3 decimal places.

• 52.4466 has 4 decimal places.

• 3 + 4 = 7.

• Move decimal places from the right.

• 3278436966.0 becomes 327.8436966

### Write a story problem for 4.2 * 3.17

• Jenny put 4.2 gallons of gas into her pink Jeep. Each gallon costs \$3.17. How much did she pay for gas?

### Write a story problem for 1.8 * 5.42

• Tommy went to FoodTown and bought 1.8 pounds of chicken. Each pound of chicken costs \$5.42. How much did Tommy pay for chicken?

### Write a story problem for 16 * 2.28

• Marissa has 16 pairs of shoes. Each pair of shoes weights 2.28 pounds. How much do her shoes weigh in total?

### Fill in the blanks!

a. A positive number * a positive number = a ________ number.

b. A positive number * a negative number = a _________ number.

c. A negative number * a positive number = a __________ number.

d. A negative number * a negative number = a _________ number.

a. Positive

b. Negative

c. Negative

d. Positive

### What property explains why -4 * 6 = 6 * -4

• The commutative property of multiplication.

### What is -9 * 7

• Why?

• 9 * 7 = 63

• One of the multiples is positive and the other is negative, therefore the solution is negative.