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    • ▾Kindergarten
      • ▾Counting and place value
        • •Counting from pictures, oral response
        • •Counting objects by property
        • •Counting to 100 by ones
        • •Counting to 100 by tens
        • •Counting on by ones or tens
        • •Understanding zero
        • •Write numbers
        • •Counting objects, line or rectangular array
        • •Counting objects, scattered and circular arrangements
        • •Compare by matching or counting
        • •Compare written numerals
        • •Counting by category
        • •Count, represent and write teen numbers
      • ▸Addition and subtraction
        • •Add and subtract within 5
        • •Composing and decomposing within 10
        • •Addition, missing number word problems
        • •Addition and subtraction, concrete and visual
        • •Add and subtract within 10
      • ▸Measurement and geometry
        • •Compare measurements without tools
        • •Measurement tools
        • •Naming shapes in the real-world
        • •Naming shapes regardless of orientation or size
        • •Relative positions
        • •Identify shapes and solids
        • •Compare attributes of shapes and solids
        • •Build solids
        • •Compose 2D shapes
        • •Simple repeating patterns
        • •Growing patterns
     › Kindergarten › Counting and place value

    Count, represent and write teen numbers

    Count, represent and write teen numbers. Start with 11 and 12, then proceed to 13 and 14, and so on until 19 and 20. See teen numbers as 10 and some 1s. Here's an example problem:

    If we start with \(10\) pennies, how many more do we need to get to \(13?\)

    Shown two ten frames, one fully filled and the other partially filled, count on to find the teen number. Solve one more and one less problems involving teen numbers. This skill can be practiced here. Answer missing addend problems for teen numbers. Write in missing numbers within 20. For example, 1, 2, 3, and so on, but 4, 7, and 18 are missing. Khan Academy covers all of this, except it doesn't use ten frames and doesn't cover writing teen numbers. For writing teen numbers, I suggest JoAnn's School.

    Where is writing numbers 11-20 in the Common Core?

    Watch these Khan Academy videos:

    • Teens as sums with 10
    • Teen numbers: monkeys

    Teen numbers by Khan Academy

    Conclude by giving your students this challenge:

    Butterfly Flowers by NRICH

    K.NBT.A.1: Compose and decompose numbers from 11 to 19 into ten ones and some further ones, e.g., by using objects or drawings, and record each composition or decomposition by a drawing or equation (such as 18 = 10 + 8); understand that these numbers are composed of ten ones and one, two, three, four, five, six, seven, eight, or nine ones.

    Lessons and practice problems