Practice problems for 5 2 and 5 3
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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

Practice Problems for 5.2 and 5.3


Multiply 3 47 by 2 9

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.

  • Move decimal places from the right.

  • 10063.0 becomes 10.063


Multiply 49 9 by 7 35

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.

  • Add the decimal places.

  • 1 + 2 = 3.

  • Move decimal places from the right.

  • 366765.0 becomes 366.765


Multiply 6 251 by 52 4466

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.

  • Add the 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

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

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

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

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.

  • Answers

    a. Positive

    b. Negative

    c. Negative

    d. Positive


What property explains why 4 6 6 4

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

  • The commutative property of multiplication.


What is 9 7

What is -9 * 7

  • Answer: -63

  • Why?

  • 9 * 7 = 63

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


What is 5 5

What is -5 * -5

  • Answer: 25

  • Why?

  • 5*5 = 25

  • Both of the multiples are negative; therefore the solution is positive.


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