Here we will calculate 21 cups doubled and illustrate 21 cups doubled on a measuring cup. What is 21 cups doubled? 21 cups doubled is twice 21 cups. Therefore, to double 21 cups, we multiply 21 by 2. Here is the formula, the math, and the answer to 21 cups doubled:
Cup × 2 = Cup doubled
21 × 2 = 42
21 cups doubled = 42 cups
Below is an illustration of a measuring cup. We show 21 cups and 21 cups doubled (42 cups) so you can see where they are in relation to each other.
As you can see, we filled up our measuring cup to 21 cups doubled. In other words, we filled it up to 42, which is two times 21.
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