Use standard algorithm to multiply one digit numbers

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12345678
Across
  1. 3. The first number
  2. 7. rules to be followed in calculations
  3. 8. It is considered normal
Down
  1. 1. a faster way to add same numbers
  2. 2. task requiring a solution
  3. 4. there are infinite
  4. 5. a plan
  5. 6. numerals