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:

  • Assessment Questions

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

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