As we are working with addition and subtraction we want students to understand that there are many strategies they can use to help them solve problems. They should not just rely on mental math, but instead are asked to "prove" their answers by using manipulatives, drawings, objects, or fingers. Even if they are able to fluently add and subtract, or as kindergartners say, "I just know it!", we require them to show us their work through multiple strategies:
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