Math Practice 101
Homework Explained - Math Practice 101

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Grade 3 Go Math Practice - Answer Keys
Common Core


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Multiply with 11 and 12

Essential Question What strategies can you use to multiply with 11 and 12?

  • Question 1 (request help)

    It takes Bobby 11 minutes to walk to school each morning. How many minutes will Bobby spend walking to school in 5 days?
  • Multiply. 5 x 11 =   
  • Question 2 (request help)

    One Way Break apart an array.

    Make 5 rows of 11. Use the 10s facts and the 1s facts to multiply with 11.

    5 x (10 + 1)
  • 5 x 10 = 5 x 1 =
    5 x 11 = +
    5 x 11 =
    So, Bobby will spend minutes walking to school.

Another Way Find a pattern.

  • Question 3 (request help)

    Look at the list. Notice the product has the same factor in the tens and ones places. To find 5 3 11, write the first factor in the tens and ones places.
  • 1 x 11 = 11
    2 x 11 = 22
    3 x 11 = 33
    4 x 11 =44
    5 x 11 =
    6 x 11 = 66
    7 x 11 = 77
    8 x 11 = 88
    9 x 11 = 99
  • Question 4 (request help)

    Try This! What if it took Bobby 12 minutes to walk to school?
    How many minutes will he spend walking to school in 5 days?

    Break apart the factor 12.                                     Double a 6s fact.

    5 x (10 + 2)                                                           Find the 6s product. 5 x 6 = 30 

    5 x 10 = 50        5 x 2 = 10                                     Double that product. 30 x 2 = 60

    5 x 12 = 50 + 10 = 60

    So, 5 x 12 = 60 . Bobby will spend 60 minutes walking to school.

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