Adding Decimals (Base-10 Blocks)


Use base-10 blocks to model two numbers. Then combine the blocks to model the sum. Blocks of equal value can be exchanged from one area of the mat to the other to help understand carrying when adding. Four sets of blocks are available to model different place values.

Screenshot of Adding Decimals (Base-10 Blocks) Gizmo

LESSON MATERIALS:

LEARNING OBJECTIVES:

  • Add whole numbers with regrouping.
  • Add decimals with regrouping.
    • Add decimals with the same number of digits.
    • Add decimals with different numbers of digits.
  • Explain what is happening when you "carry" a digit from one column to another during column addition.

VOCABULARY:

  • addend, base-10 blocks, base-10 system, decimal, decimal point, sum, whole number

User Recommendations (5):

  • avatar
    Hearing students discuss options as they worked was delightful.

    MATH:  3rd Grade, 4th Grade

    By: Michelle Hanna (Saskatchewan) | Recommended 118 days ago

  • avatar
    I found it very simple and very very useful for the students

    MATH:  5th Grade

    By: Mirza Ali | Recommended 275 days ago

  • avatar
    excellent simulation

    SCIENCE:  5th Grade

    By: ahmed smaili | Recommended 285 days ago

  • avatar
    This is a great visual for students learning to add decimals.

    MATH:  3rd Grade, 4th Grade

    By: Sherrie Tiitii (Hawaii) | Recommended 325 days ago

  • avatar
    Graphics are great easier reading for lower leveled students.

    MATH:  5th Grade

    By: Dena Phelps (Florida) | Recommended 329 days ago

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