K.5 Composing and Decomposing Numbers to 10

Unit Goals

  • Students compose and decompose numbers within 10.

Section A Goals

  • Compose and decompose numbers up to 9 in more than 1 way.
  • Write expressions to represent decompositions.

Section B Goals

  • Solve Put Together, Total Unknown, Put Together/Take Apart, Both Addends Unknown, Add To, Result Unknown, and Take From, Result Unknown story problems.

Section C Goals

  • For any number from 1 to 9, find the number that makes 10 when added to the given number.
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Glossary Entries

  • above
  • add

    4 + 3

    Four plus three

  • below
  • beside
  • circle
  • equation

    10 = 6 + 4

    5 - 2 = 3

  • expression

    6 + 4


    3 - 3

  • fewer
  • less

    3 is less than 9

  • longer

    The straw on the top is longer than the straw on the bottom.

  • more
  • next to
  • number writing reference

    1

    one

    2

    two

    3

    three

    4

    four

    5

    five

    6

    six
    Five-frame, full. Below, 1 dot.

    7

    seven

    8

    eight

    9

    nine

    10

    ten

  • rectangle

  • shorter

    The straw on the bottom is shorter than the straw on the top.

  • subtract

    5 - 2

    Five minus two

  • triangle