Prime numbers and standard form key terminology crossword

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12345678910111213
Across
  1. 4. what form is the number 3 x 10^4 written in?
  2. 5. a type of number whose factors are only one and itself
  3. 7. 0.00546 rounded to 0.0055 is rounded to 2 _________ figures
  4. 8. the first odd prime number
  5. 10. when working out if numbers are prime, only numbers less than or equal to the ___________ of the number being investigated need to be considered
  6. 12. to write a number in standard form we multiply it by powers of _____?
  7. 13. acronym for the smallest positive number that is a multiple of two or more numbers
Down
  1. 1. we can use the _______ method to work out if a number is prime or not
  2. 2. acronym for the highest number that divides exactly exactly into two ore more numbers
  3. 3. a type of tree we use to work out the factors of a number. it can also be used to find the Highest common factor and the lowest common multiple of two or more numbers.
  4. 6. numbers we can multiply together to get another number
  5. 9. the result of multiplying a number by another number (an integer)
  6. 11. the only even prime number