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Year 8 extension

  1. Tama and Ana share a jar of marbles in the ratio 3 : 5. Ana then gives Tama 10 of her marbles, and now they have the same number. How many marbles are there altogether?
  2. At the Ōtautahi Saturday market, Mere spends half of her money plus $2 more at the first stall. At the second stall she spends half of what is left plus $2 more. She now has $5. How much money did she start with?
  3. In a regular polygon, each interior angle is 4 times as big as each exterior angle. How many sides does the polygon have?
  4. Without a calculator, work out 2026² − 2025².
  5. Hemi thinks of a number. He multiplies it by 3, subtracts 7, then halves the result. His answer is 4 more than the number he started with. What was his number?
  6. What is the last digit of 7²⁰²⁶ (7 multiplied by itself 2026 times)?
  7. A spinner has three sectors: red with an angle of 90°, blue with 150° and green with 120°. Rāwiri spins it twice and records whether both spins land on the same colour. He does this 720 times. About how many times should he expect the same colour twice?
  8. An analogue clock with a 12-hour face gains 3 minutes every hour. It is set to the correct time at 9:00 am on Monday. How long until it next shows the correct time?
  9. What is the smallest positive whole number n that makes 360 × n a perfect cube?
  10. Tama scored 90 in a class test. When his score is taken out, the mean score of the class drops from 72 to 70. How many students are in the class, including Tama?