Form a equivalent problem for 4 1/2

divided by 1/2 by doubling both the dividend and divisor. Then find the quiotent.
Would that be 9 divided by 1 =9

From the data given, you are right.

To form an equivalent problem, we need to double both the dividend and divisor of the original problem.

Original problem: 4 1/2 ÷ 1/2

Dividend: 4 1/2 (or 9/2)
Divisor: 1/2

Now, let's double both the dividend and divisor:

Doubled dividend: 2 * (4 1/2) = 2 * (9/2) = 18/2 = 9
Doubled divisor: 2 * (1/2) = 1

The new problem becomes: 9 ÷ 1

And as you correctly stated, the quotient is indeed 9.

8 2/4 devided by half = 4 1/2

30 divided by 840