How to learn Grade 2: Mathematics
Iowa academic standards: Mathematics, Grade 2
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1. Number and Operations in Base Ten · Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones. Understand the following as special cases.
- A Hundred Is Ten Tens: Understand that 100 can be thought of as a bundle of ten tens — called a 'hundred'
- The three digits of a three-digit number: Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones
2. Operations and Algebraic Thinking · Fluently add and subtract within 20 using efficient mental strategies listed below.
- Addition and subtraction within 20: Add and subtract within 20 using strategies such as making ten, decomposing a number leading to ten, and using known facts
- Fluent adding and subtracting within 20: Fluently add and subtract within 20 using mental strategies; know from memory all sums of two one-digit numbers
3. Operations and Algebraic Thinking · Use addition and subtraction within 100 to solve one- and twostep word problems involving the problem types listed below, with unknowns in all positions, by using o
- Two-Step Word Problems: Solve one- and two-step word problems within 100 using addition and subtraction, with unknowns in all positions