Primary school mathematics

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Across
  1. 5. To take one quantity away from another.
  2. 7. Having the same value.
  3. 11. To split into equal parts or groups.
  4. 12. To ascertain the size, amount, or degree of something.
  5. 14. A part per hundred.
  6. 15. The amount of space that an object occupies.
  7. 16. The form or outline of an object.
  8. 18. A shape with three sides and three angles.
  9. 20. A numeral between 0 and 9.
Down
  1. 1. A round plane figure whose boundary consists of points equidistant from a fixed point.
  2. 2. To increase the number by a certain factor.
  3. 3. A part of a whole expressed using a numerator and denominator.
  4. 4. The space between two intersecting lines or surfaces.
  5. 6. A shape with four equal sides and four right angles.
  6. 8. The total distance around the edge of a figure.
  7. 9. A fraction expressed in a special form using powers of ten, often with a dot.
  8. 10. A diagram showing the relation between variable quantities.
  9. 13. The result of adding two or more numbers.
  10. 17. The measure of space inside a shape.
  11. 19. To combine two or more quantities to get one quantity.