Monday, November 18, 2013

My Strategy

Trevor has to drive 422 km’s. He looks at his odometer and sees he has gone 289 kms. How much further has he got to go?

Answer: 133.
Strategy: Add 1 onto 289 = 290 … 290 + 10 = 300 … 300 + 100 = 400 … 400 + 22 = 422.
1 + 10 + 100 + 22 = 133

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