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Problems: '2:7 = 6:___' (21), '5:3 = ___:12' (20), '4:9 = 16:___' (36). 12 problems. Show the ratio table as a hint if wrong (the multiplication factor reveals the answer). Include both scaling up and scaling down. Also: 'Are these equivalent? 3:8 and 12:32' (Yes/No with explanation).
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