Unit 7 Overview:

In this unit, students will use a variety of strategies to add and subtract numbers. Children will practice subtracting. They will solve word problems where they will need to “take apart” and “take from” using pictures, drawings, number lines and equations. They will use strategies of “counting back” and “subtracting 0, 1, 2”. Children will also continue to develop their understanding of the equal sign.

• Students will use objects, drawings, and equations to model and solve real world addition and subtraction story structures (both addends and comparing differences unknown) with sums and differences within 20. (1.OA.A.1)
• Students will apply properties of operations as strategies to add and subtract. Examples: If 8+3=11 is known, then 3+8=11 is also known. (Commutative property of addition.) To add 2+6+4, the second two numbers can be added to make a ten, so 2+6+4=2+10=12. (Associative property of addition.) (1.OA.B.3)
• Students will understand subtraction as an unknown-addend problem. For example, subtract 10-8 by finding the number that makes 10 when added to 8. (1.OA.B.4)
• Students will 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 (1.OA.A.2)
• Students will use the commutative property and inverse operations (fact families) to solve real world situations with unknown addends with sums and differences within 20. (1.OA.D.8)
• Students will use addition and subtraction strategies (plus/minus 0, 1, 2, make/break apart 10 and doubles/using doubles) with sums and differences within 20 to develop fluency within 10. (1.OA.C.6)
• Students will organize, represent, and interpret data with up to three categories; ask and answer questions about the total number of data points, how many each category, and how many more or less are in one category than in another. (1.MD.C.4)