Mariko is in Grade 1 and is receiving formal arithmetic instruction.How will Mariko likely solve an arithmetic problem?

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At this stage, Mariko is most likely learning basic arithmetic operations such as addition and subtraction. She is likely to count mentally and visualize the objects or numbers involved in the problem. While counting aloud and using fingers may also be used, counting mentally is a more advanced and efficient strategy. Using a calculator is usually not taught until later years.

Mariko Is in Grade 1 and Is Receiving Formal Arithmetic