Maths "Crossnumber"

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Across
  1. 2. Solve 570 = 10x + 10
  2. 3. Solve 4x - 23 = 77
  3. 7. What is 54 - -3?
  4. 8. In a quadrilateral, three angles have 34, 61, and 79 degrees. How many degrees in the fourth angle?
  5. 10. If I have £34.21 and my friend gives me £68.21 how many pennies will I have?
Down
  1. 1. Five million, eight hundred thousand and two
  2. 2. Calculate 468+43
  3. 4. Simplify 7a - 2a + 12b - 10 - 5b (include the operations no spaces)
  4. 5. Nine hundred thousand, eight hundred and twelve
  5. 6. A square number beginning with 8
  6. 9. Calculate 4.8 x 15