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Weekly Problem 49 - 2013
What is the value of 2000 + 1999 × 2000?

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The numbers 72, 8, 24, 10, 5, 45, 36, 15 are grouped in pairs so that each pair has the same product. Which number is paired with 10?

Going Round in Circles

Age 11 to 14 Challenge Level:

You might find it helpful to start by taking a look at the Level 1 and 2 problems in Shifting Times Tables.