The correct statements for finding 15 ÷ 7 are:
B. Multiply 15 by 9, then divide by 2.
D. Multiply 15 by 9, then multiply by 1/2.
These statements use equivalent operations to find the value of 15 ÷ 7, but with different intermediate steps. To see why they are equivalent, consider the following:
B. Multiplying 15 by 9 gives 135, which is the numerator in the fraction 15/7. Dividing 135 by 2 gives 67.5, which is equal to 15 ÷ 7.
D. Multiplying 15 by 9 gives 135, which is the numerator in the fraction 15/7. Multiplying by 1/2 gives the fraction 67.5/2, which is equivalent to 15/7 because dividing a fraction by a number is equivalent to multiplying by its reciprocal.
The other statements are not correct because they do not give the correct answer for 15 ÷ 7.