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Practice Problems for 5.2 and 5.3PowerPoint Presentation

Practice Problems for 5.2 and 5.3

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Practice Problems for 5.2 and 5.3

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Practice Problems for 5.2 and 5.3

- 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.
- Move decimal places from the right.
- 10063.0 becomes 10.063

- 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.
- Add the decimal places.
- 1 + 2 = 3.
- Move decimal places from the right.
- 366765.0 becomes 366.765

- 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.
- Add the decimal places.
- 3 + 4 = 7.
- Move decimal places from the right.
- 3278436966.0 becomes 327.8436966

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

- 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?

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

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.

- Answers
a. Positive

b. Negative

c. Negative

d. Positive

- The commutative property of multiplication.

- Answer: -63
- Why?
- 9 * 7 = 63
- One of the multiples is positive and the other is negative, therefore the solution is negative.

- Answer: 25
- Why?
- 5*5 = 25
- Both of the multiples are negative; therefore the solution is positive.