Two-Category Counts from a Total
Two interacting categories (right vs wrong answers, animals with different leg counts, coins of different values) combine into one total; the counts are recovered by assuming one case and adjusting, or by systematic guess-and-check. This is the elementary precursor to systems of equations.
grade 2–3 MDOA Guess and CheckMake a Systematic List
진행 단계 (3)
2-2 1. 1000원, 500원, 100원짜리로 1000원을 만들 수 있다. 2.MD.C.8
2-2 2. 예상하고 확인하여 답을 찾는다. 3.OA.A.33.OA.D.8
3-1 3. 두 조건 중 한 쪽만 선택하여 구한다. 3.OA.D.83.OA.A.3