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  • 1. Dissector 10 cm 20 cm One has a rectangle of dimensions 20 cm x 10 cm. Make exactly two straight cuts and transform it into a 2 square of area 200 cm . Explain!
  • 2. Ratio With four congruent isosceles right triangles and a square this pentagon was composed. Determine the ratio of the shaded area to the area of the pentagon. Justify your answer!
  • 3. Cubic This cube is made up of black and white unit cubes. The black regions indicate that the black cubes cross the cube all the way through the opposite face. How many white cubes make up the large cube?
  • 4. Good calculator In the diagram the product of the numbers in each quarter of the circle is the same. Determine a x b x c. 10 30 16 6 4 b 24 a 15 12 10 c
  • 5. Primes Reconstruct the multiplication in such a way that each of the prime digits appears exactly two times.
  • 6. What we must decide is perhaps how we are valuable, rather than how valuable we are. F. Scott Fitzgerald