Lower Elementary:
Question: Susan and her parents are making a disaster survival kit. Each of them needs 2 gallons of water per day. How much water does Susan's family need in a survival kit to last 5 days?
Answer: 30 gallons
Solution: Each person needs 2 gallons of water, five times. That’s 2 × 5 = 10 gallons of water each. Since there are 3 people in Susan’s family, they need 10 gallons, three times. That’s 10 × 3 = 30 gallons of water altogether.
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