Chapter 1   


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Million Mystery



A chart illustrating thousands and ones.
A bubble containing: 'In a number, each group of 3 digits separated by a comma is called a period.'

What's the mystery number?

  • It's greater than one million but less than ten million.
  • It's an even number.
  • None of the digits is less than 3.
  • No digit is used more than once.
  • The sum of the digits in the ones period is 12.
  • The digit in the ten thousands place is equal to the sum of the digits in the tens and hundreds places.
  • The digit in the millions place is 2 more than the digit in the thousands place.
  • The digit in the hundred thousands place is twice the digit in the tens place.
What is the mystery number?


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