![]() Subtraction is non-commutative so care needs to be taken with the order of subtraction. When an addition problem is given, subtraction solves for the variable.Speed badges are attainable because there is only one step necessary to arrive at the answers. ![]() The user is expected to find the correct answer and type it in the space provided.Īccuracy badges can be attained on this exercise with knowledge of the properties of equality.
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