The student must be able to determine the value of a missing number in an equation. They must be able to explain their reasoning and tell how they know the resulting value makes the number sentence true.
Complete the following number sentence to make it true. Explain your solution and thinking and how you know your answer is correct.12 + 3 = _____ + 5
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1.5 Algebraic reasoning. The student applies mathematical process standards to identify and apply number patterns within properties of numbers and operations in order to describe relationships. The student is expected to:
(F) determine the unknown whole number in an addition or subtraction equation when the unknown may be any one of the three or four terms in the equation