Final answer:
Mr. Watson will need to multiply the number of rows by the number of plants per row, which is 3 times 8, amounting to a total of 24 plants for his garden.
Step-by-step explanation:
The student is asking a multiplication question in mathematics. Mr. Watson wants to plant a garden with 3 rows of plants and 8 plants in each row. To find the total number of plants he needs, we can multiply the number of rows by the number of plants per row. The calculation would be:
3 rows × 8 plants/row = 24 plants
Therefore, Mr. Watson will need a total of 24 plants for his garden.