Oh, what a happy little question! You can multiply 19 and 21 together to get 399. Just like mixing the perfect colors on your palette, these two numbers come together beautifully to create 399. Remember, there are always infinite possibilities waiting to be discovered in the world of numbers.
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If you are wanting to add odd numbers to get 399, it won't work. If you are wanting to multiply to get 399, it is 19 x 21.
When you multiply two numbers, you get the product
When you multiply two numbers, it is called the product.
The two (or more) numbers that you multiply are called factors. (The result of the multiplication is called the product.)
Two numbers that you can multiply together to get 72 are: 36 and 2.