The order of things - Maths

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123456
Across
  1. 2. They look like half-moons.
  2. 5. - taking things away.
  3. 6. - Squared, cubed, really small numbers
Down
  1. 1. - timing things together
  2. 3. - Summing things up
  3. 4. - Cutting numbers up into little pieces