
Here we will calculate 9 cups doubled and illustrate 9 cups doubled on a measuring cup. What is 9 cups doubled? 9 cups doubled is twice 9 cups. Therefore, to double 9 cups, we multiply 9 by 2. Here is the formula, the math, and the answer to 9 cups doubled:
Cup × 2 = Cup doubled
9 × 2 = 18
9 cups doubled = 18 cups
Below is an illustration of a measuring cup. We show 9 cups and 9 cups doubled (18 cups) so you can see where they are in relation to each other.

As you can see, we filled up our measuring cup to 9 cups doubled. In other words, we filled it up to 18, which is two times 9.
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