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