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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 and subtract within 20, word problems

    First, students will learn how to solve word problems by modeling each as an addition or subtraction problem. For addition problems, the sum will never be more than 20. For subtraction problems, the minuend will never be more than 20.

    Addition and subtraction word problems: superheroes

    Addition and subtraction word problems 1

    Next, students will learn how to solve word problems by modeling each as a missing addend problem, or a subtraction problem.

    Addition and subtraction word problems: gorillas

    Addition and subtraction word problems 2

    Next, give your students this challenge:

    Up and Down by NRICH

    Conclude by leading this investigation:

    Addition Boomerang
    by MathPickle

    1.OA.A.1: Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.