math and science

1234567
Across
  1. 1. what you weigh something with
  2. 2. when you take something away
  3. 3. something you write with
  4. 5. someone who teaches you
  5. 7. when you divide what is that called
Down
  1. 1. when you add something times 2
  2. 2. person who is being taught
  3. 4. something you write in
  4. 6. what you call adding numbers