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    • ▾1st grade
      • ▸Place value
        • •Count and write numbers within 120
        • •Skip count by 3s and 4s
        • •Place value with tens
        • •Compare two-digit numbers
      • ▾Addition and subtraction
        • •River crossing puzzles
        • •Add and subtract within 20
        • •Add within 20, word problems involving three addends
        • •Use one addition problem to solve another
        • •Add by making tens
        • •Subtract by adding
        • •Understand the equals sign
        • •Add and subtract within 20, missing number problems
        • •Add and subtract within 20, word problems
        • •Add within 100, concrete and pictorial
        • •10 more or 10 less
        • •Subtract multiples of ten from multiples of ten
      • ▸Measurement, data, and geometry
        • •Order without tools
        • •Measure given a unit
        • •Bar and picture graphs having three categories of data
        • •Tell and write time, hour and half-hours
        • •Definitions of shapes
        • •Compose 2D and 3D shapes
        • •Halves and quarters
     › 1st grade › Addition and subtraction

    Add within 20, word problems involving three addends

    Solve addition word problems involving three addends and a sum within 20. Example:

    Chloe was at a petting zoo. She pet 2 lambs, 3 goats, and 1 pig. How many animals did Chloe pet?

    Adding 5 + 3 + 6 by Khan Academy

    Add 3 numbers by Khan Academy

    Next, give your students this challenge:

    1, 2, 3 Magic Square by NRICH

    Conclude by leading this investigation:

    Bubbling Cauldrons (single digit addition)
    by MathPickle

    1.OA.A.2: Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.