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2 + 4 + 6 + 8 + 10 = 30 In general, the sum of the first n even numbers is n(n+1). Replacing n with 5 we have 5x6 which equals 30 as we found by direct calcuation. The formula is nice when you have many numbers. For example, finding the sum of the first 100 positive even numbers would be a PAIN! But using the formula is it simply 100x101.
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Are all multiples of 5 even numbers?
no, for example 25 cannot be divided by 2 Half of the multiples of 5 are even numbers. For instance, out of the first ten (5, 10, 15, 20, 25, 30, 35, 40, 45, 50) five of them are even numbers.
What is one positive number is five times another positive number. The difference between the two numbers is 116 find the numbers?
5x - x = 116so4x = 116sox = 29 and 5x = 145
If a composite number has the first five prime numbers as factors what is the smallest number it could be?
Just multiply the first five prime numbers! 2x3x5x7x11 = 6x35x11 = 210x11 = 2310. Any multiple of this number "has the first five prime numbers as factors", but 2310 is the smallest such number.
What is the product of the first five prime numbers?
The first five prime numbers are 2, 3, 5, 7, 11. The product of these five numbers is equal to 2 x 3 x 5 x 7 x 11 = 2310.
Write five positive numbers that are less than 2.5?
0.01, 0.001, 0.0001, 0.0000001 and 2.4542
