Castle 4

Georgia's K-12 Mathematics Standards:

• 1.NR.2.1 — Use a variety of strategies to solve addition and subtraction problems within 20.
• 1.NR.2.2 — Use pictures, drawings, and equations to develop strategies for addition and subtraction within 20 by exploring strings of related problems.
• 1.NR.2.3 — Recognize the inverse relationship between subtraction and addition within 20 and use this inverse relationship to solve authentic problems.
• 1.NR.2.5 — Use the meaning of the equal sign to determine whether equations involving addition and subtraction are true or false.
• 1.NR.2.6 — Determine the unknown whole number in an addition or subtraction equation relating to three whole numbers.
• 1.NR.2.7 — Apply properties of operations as strategies to solve addition and subtraction problem situations within 20.

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