## Mi Math Standards

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## 1 |
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## 1.NBT.C.5 | ||
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Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
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## 1.NBT.C.6 | ||
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Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.
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## 1.OA.A | ||
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Grade 1 » Operations & Algebraic Thinking » Represent and solve problems involving addition and subtraction. | ||

## 1.OA.A.1 | ||
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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.
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## 1.OA.A.2 | ||
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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.
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## 1.OA.B | ||
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Grade 1 » Operations & Algebraic Thinking » Understand and apply properties of operations and the relationship between addition and subtraction. | ||

## 1.OA.B.3 | ||
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Apply properties of operations as strategies to add and subtract.
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## 1.OA.B.4 | ||
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Understand subtraction as an unknown-addend problem.
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## 1.OA.C | ||
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Grade 1 » Operations & Algebraic Thinking » Add and subtract within 20. | ||