During Unit 1, your child will work on becoming fluent with adding and subtracting within 20. Basic facts for addition refer to all sums of two one-digit numbers. Over time, fluency with number relationships leads to memory of the addition facts and application to subtraction.  Fluency is defined as solving facts quickly and accurately without halting, stumbling or reversing oneself. 

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Key Vocabulary:  Add, Addend, Data, Difference, Equal, Equality, Equation, Fluent, Fewer, Graph, Inverse, Minuend, Minus, More, Number Line, Number Sentence, Plus, Related Fact, Scale, Strategy, Subtrahend, Sum

Students need to:

  • Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.
Addition and Subtraction Mental Strategies
  • Use addition and subtraction within (20) to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.
 Using an Organizer
Bar Model Comarisons

Writing Equations

Bar Model Equations
  • Draw a picture graph and a bar graph (with single-unit scale) to represent a data set with up to four categories. Solve simple put-together, take-apart, and compare problems using information presented in a bar graph.
Bar Graphs and Pictographs
  • Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2, ...
Open Number Line