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The World of Numbers

Checkpoint: fractions and the decimals they make

Five ideas so far, one question on each. Retry any time.

What is 0.375 as a fraction in lowest terms?

What is halfway between 1/3 and 1/2?

Which fraction has a decimal that stops?

Dividing by 7, what is the most digits a block can have?

Which lines share a tail for d = 0.2555…?

0 of 5 answered

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This track

  1. 0 Start here
  2. 1 Every number so far is one integer over another
  3. 2 There is always another one in the gap
  4. 3 Which fractions stop, and what decides it
  5. 4 A block that repeats is the number written out
  6. 5 Turning a repeating decimal back into a fraction
  7. 6 Checkpoint: fractions and the decimals they make
  8. 7 A length you can draw and cannot write
  9. 8 The argument that no fraction can do it
  10. 9 A spiral built one right triangle at a time
  11. 10 Squeezing it between two fractions
  12. 11 Checkpoint: the numbers that are not fractions
  13. 12 One number can have two decimal names
  14. 13 A block that turns round: 142857
  15. 14 The decimal tells you if a number is rational
  16. 15 The big picture
  17. 16 Track quiz

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