If you have to stick with positive whole numbers,
then there are only two:
1 x 25
and
5 x 5
To make 80 using numbers between 3 and 25, you can use addition, multiplication, or combinations of both. For example, the pairs (55, 25), (40, 40), and (30, 50) can be used in addition, while multiplication allows for combinations like (4 × 20) or (8 × 10). Additionally, you can find combinations of multiple numbers (like 20 + 20 + 20 + 20) to reach 80. However, the specific combinations will depend on how strictly you interpret the use of numbers.
15x2x10
1234780979
There are several ways to make 20 using different combinations of numbers. For example, you can add 10 + 10, or 15 + 5. You can also use multiplication, such as 4 x 5, or combinations of addition and multiplication like 2 x 10. Additionally, using subtraction, you can express it as 25 - 5.
Oh, what a happy little question! Let's explore the wonderful world of multiplication with the number 36. We can find combinations like 1 x 36, 2 x 18, 3 x 12, 4 x 9, and 6 x 6. Each combination is like a unique brushstroke on the canvas of mathematics, creating a beautiful and colorful pattern of possibilities. Just remember, there's no mistakes in math, only happy accidents!
To ensure that all possible multiplication combinations for a number are found, systematically list all pairs of factors that multiply to that number. For any integer ( n ), check pairs starting from 1 up to ( \sqrt{n} ), as any factor larger than ( \sqrt{n} ) would have a corresponding smaller factor. Additionally, confirm that each pair is unique and ordered to avoid duplicates. This method guarantees that all combinations are accounted for efficiently.
To find pairs of numbers that multiply to equal 75, you can consider several combinations. For example, 1 x 75, 3 x 25, and 5 x 15 are all valid pairs. Additionally, 7.5 x 10 also equals 75. Each pair provides a different way to express the multiplication that results in 75.
(144,1)(72,2)(48,3)(36,4)(24,6)(18,8)(16,9)
William Arthur Brownell has written: 'Learning the multiplication combinations' -- subject(s): Multiplication, Psychology of Learning
Their is 25 combinations
52=25
There are 480,700 combinations and I am not going to even try to list them!