Unit 2b

1MA.A.2 solve real-life addition and subtraction problems within 20; explain the relationship between addition and subtraction and apply the properties of operations 

• 2.a solve addition and subtraction problems within 20 using a variety of strategies 

• 2.b use pictures, drawings, and equations to develop strategies for addition and subtraction within 20 by exploring strings of related problems 

• 2.c recognize and use the inverse relationship between subtraction and addition within 20 to solve authentic problems 

• 2.d add and subtract fluently within 10 using a variety of strategies 

• 2.e use the meaning of the equal sign to determine whether equations involving addition and subtraction are true or false 

• 2.f determine the unknown whole number in an addition or subtraction equation relating to three whole numbers 

• 2.g apply properties of operations (i.e., Commutative and Associative Properties of Addition) as strategies to solve addition and subtraction problem situations within 20

1MA.E.6 use appropriate tools to measure, order, and compare intervals of length and time, as well as denominations of money to solve real-life, mathematical problems and analyze graphical displays of data to answer relevant questions

• 6.d ask questions and answer them based on gathered information, observations, and appropriate graphical displays to compare and order whole numbers (e.g., picture graphs, bar graphs with up to 3 categories)