In this lesson, students will use a variety of strategies to add, subtract, and explain their mathematical thinking and reasoning to solve situational stories. Aligned to Common Core State Standards: 1.OA.2, 1.OA.3, 1.NBT.4
Leprechaun Traps: Addition within 100
Grade Level
Grades K-2
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Standards Alignment
Common Core State Standards
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Leprechaun Traps - Addition Within 100
Standards
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.
Apply properties of operations as strategies to add and subtract.
Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, 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. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.
