Addition and subtraction

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Across
  1. 3. Fifteen minus four leaves this.
  2. 5. Nairitee collected 28 beads and used 20 to make garlands. How many does she have left?
  3. 7. ___ - 19 = 2
Down
  1. 1. Seven plus three gives this total.
  2. 2. 21+__ = 28
  3. 4. Twenty seven minus nine gives this number
  4. 6. Sara has 20 pens. 7 are blue, and the rest are red. How many red pens does she have?