Grade Level: 3rd Skill: Reasoning Topic: Check if an Answer is Reasonable Goal: Evaluate the reasonableness of the solution in the context of the original situation. Skill Description: Mathematical Reasoning: evaluation, problem solving Evaluate the reasonableness of the solution in the context of the original problem. Does the answer make sense in that particular situation?

### Sample Problems

 (1) My dad mowed the lawn for 40 minutes, weeded for 25 minutes and then planted new tomatoes for 20 minutes. Is it reasonable to say that he came inside an hour later? (No, he came in 1.5 hours later) (2) Martha read four books spread out evenly over the summer. They had a total of 48 chapters and she read for 12 weeks. Is it reasonable to think that Martha read four chapters a week over the summer? (Yes, we don’t know for sure, but 12 x 4 = 48, so that would spread the reading out evenly) (3) Jenny the cake maker made a four-tiered cake for the upcoming wedding. The bottom tier fed 45 people, while the second and third tier fed 30 people each. The top tier fed 20 less than the bottom. Could the cake feed all 150 guests at the wedding? (Nope, the cake will feed 130) (4) The piano teacher told Rachel that she needed to practice 5 minutes the first week each day, 10 minutes the second week each day and 15 minutes the third week. Rachel practiced 70 minutes the second week and more than 2 hours the third week total. (No, Rachel practiced 105 minutes, not 120 minutes) (5) Is it reasonable: If the dog barked the last three Tuesdays and Thursdays, is it reasonable to think that the dog will bark next Tuesday and Thursday? (Yes. There could be many reasons why, such as a mail delivery, an owner leaving or coming home, a loud truck that drives by those days)

### Online Resources

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