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    • ▾2nd grade
      • ▸Add and subtract within 20
        • •Add to count rectangular arrays
        • •Mentally add and subtract within 20
      • ▸Place value
        • •Place value with hundreds
        • •Convert between various representations, numbers within 1000
        • •Counting and skip-counting within 1000
        • •Intro to even and odd
        • •Compare three-digit numbers
      • ▸Add and subtract within 100
        • •Mentally add and subtract within 100
        • •Add and subtract within 100, abstract
        • •One-step word problems, add and subtract within 100
        • •Two-step word problems, add and subtract within 100
      • ▸Add and subtract within 1,000
        • •Add and subtract within 1,000
        • •Add multiple two-digit numbers
        • •Mentally add or subtract powers of ten
      • ▸Money and time
        • •Money word problems, including dollars
        • •Tell and write time, five minute increments
      • ▾Measurement
        • •Compare lengths by measuring
        • •Estimate lengths
        • •Add and subtract within 100 to solve word problems involving lengths
        • •Add and subtract within 100 on the number line
      • ▸Data
        • •Plot measurements on a line plot
        • •Draw picture and bar graphs
      • ▸Geometry
        • •Partition rectangles into rows and columns
        • •Area of a rectangle by counting unit squares
        • •Partition circles and rectangles into equal shares
        • •Draw shapes with certain attributes
        • •Intro to tessellations
     › 2nd grade › Measurement

    Estimate lengths

    Estimate lengths involving inches, feet, centimeters, and meters. Useful skill for looking at maps and estimating distance. Also useful for selecting an appropriate tool. For example, if something is long, I will use a tape measure. If it’s short I’ll use a ruler, simply because a ruler is easier to wield.

    Estimating lengths

    Do these Khan Academy exercises:

    • Estimate lengths
    • Estimate lengths (US Customary units)

    Conclude by leading this investigation:

    Celtic Counting (counting, proof)
    by MathPickle

    2.MD.A.3: Estimate lengths using units of inches, feet, centimeters, and meters.