Quad: Four

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Across
  1. 4. one part of something that is evenly divided into four parts
  2. 5. one of four babies born at the same time to the same mother
Down
  1. 1. to become four times bigger in value of a number
  2. 2. a group of four singers or musicians who perform
  3. 3. a flat shape that has 4 straight sides & 4 angles