Maths homework

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Across
  1. 4. addition a ‘plus’ column method
  2. 5. _dd_t__n
  3. 10. spread out
  4. 12. I ________ 8cm from my table to the chair
  5. 14. it is used to subtract in a column
  6. 16. I am 139cm tall. My ______ is 139cm
  7. 17. the length between metres and millimetres
  8. 20. closely packed together
  9. 22. ten more than units
  10. 23. I see a ______________ grid over there
Down
  1. 1. a 9 becomes ten or a 326 becomes 330 or 300
  2. 2. they end in two zeroes
  3. 3. count TO something
  4. 6. they are nine thousands less than ten thousands
  5. 7. antonym to shortest
  6. 8. think that something would happen (used in maths and science)
  7. 9. synonym of bigger
  8. 11. a mathematical guess
  9. 12. 100cm
  10. 13. a number no one knows
  11. 15. they are also called units
  12. 18. facts about numbers
  13. 19. a sign, number, letter..
  14. 21. example: 1 2 3 4 5 6 7 8 9 0