Final answer:
The property shown by the number sentence "9/1 = 9 ones in division" is Identity property of multiplication.
Step-by-step explanation:
The property shown by the number sentence "9/1 = 9 ones in division" is Identity property of multiplication. In this case, when we divide 9 by 1, we get 9 as the quotient. The identity property of multiplication states that any number multiplied by 1 is equal to the original number. Since division is essentially the inverse operation of multiplication, when we divide a number by 1, we get the same number as the quotient.
For example, 5 divided by 1 is 5, 10 divided by 1 is 10, and so on.