Maths puzzle

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Across
  1. 2. _____is the mathematical method for dividing large numbers into smaller groups or parts
  2. 5. ___ is a way to express a number as the sum of the place values of its digits.
  3. 8. The LENGTH AROUND THE SIDES OF A SHAPE
  4. 10. The FACT OF BEING HEAVY
  5. 11. OF A SET OF RODS FIXED TO A BASE
  6. 12. In subtraction the difference is always ___ minuend.
  7. 13. Addition of any number with this is the number itself.
Down
  1. 1. A shape in which opposite sides are equal
  2. 3. Standard UNIT OF MEASURMENT
  3. 4. The single numbers used to represent values in math
  4. 6. A number that is divisible by 2
  5. 7. Shape with seven sides
  6. 9. Biggest UNIT OF WEIGHT