When you multiply any number by 5, the last digit of the product will always be 5 or 0. For example, 5 times 4 is 20, 5 times 5 is 25, 5 times 6 is 30, 5 times 7 is 35, 5 times 8 is 40, etc., etc.
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Ah, let's take a moment to appreciate the beauty of mathematics. When you multiply a number by 5, you are simply adding that number to itself five times. It's like painting a lovely little scene of repetition and growth on the canvas of numbers. Just remember, math is like painting - with practice and patience, you can create something truly wonderful.
the expression of the product of 5 and a number
If three is subtracted from the product to get 17, the product must be 20. Then find what number can be multiplied by 5 to get 20. The answer is 4.
25 can be either the product of 1 and 25, or the product of 5 and 5. Since there are two digits in the number, the answer can only be 55. This makes sense, since 55 is divisible by 5, and the product of 5 and 5 is 25.
The sum of 8 and 5 is 13. There is then no number with which to calculate its product.
n x (n -5)