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What factors multiply to 21?
The factors of 21 are 1, 3, 7 and 21. Factor pairs of the number 21 are the numbers that result in the original number multiplying them together. To find the factors of a number, 21, we can use the factorization method.
What is the multiple of 21?
Solution: The first 10 multiples of 21 are, 21, 42, 63, 84, 105, 126, 147, 168, 189 and 210. Each multiple of 21 is entirely divisible by 7 and occurs in the table of 7, hence, each multiple of 21 is also the multiple of 7.
How many factors does 25 have?
The factors of 25 are 1, 5, and 25.
What is the factors of 81?
Factors of 81
- Factors of 81: 1, 3, 9, 27, 81.
- Negative Factors of 81: -1, -3, -9, -27 and -81.
- Prime Factorization of 81: 34 or 3 × 3 × 3 × 3.
What are the first 10 multiples of 25?
The multiples of 25 are 25, 50, 75, 100, 125, 150, 175, 200, 225, 250, 275, 300, etc.
What are the four multiples of 21?
Therefore , the first four multiples of 21 are 21,42,63,84.
What are the common factors of 18 and 24?
Correct answer: 18 and 24 share one 2 and one 3 in common. We multiply them to get the GCF, so 2 * 3 = 6 is the GCF of 18 and 24.
What factors do 18 and 30 have in common?
GCF of 18 and 30 by Listing Common Factors There are 4 common factors of 18 and 30, that are 1, 2, 3, and 6. Therefore, the greatest common factor of 18 and 30 is 6.
How many factors of 15 are there?
4 factors
Factors of 15 are the list of integers that can be evenly divided into 15. It has a total of 4 factors of which 15 is the biggest factor and the positive factors of 15 are 1, 3, 5, and 15.
What do you call the factor of multiplying three numbers?
The numbers that we multiply together are called factors. When we multiply three or more numbers together, we start by multiplying any two factors first. Next, we multiply this product by another factor. If there are more than three numbers, we keep going until we have multiplied all the factors.
What’s the best way to multiply two numbers?
In other words, multiply the bottom number’s far right digit by the top number’s far right digit. If your answer is two digits long (for instance, 28), carry the first digit of your answer (e.g., 2) above the digit in the hundreds place of the top number.
When do you need more than one conversion factor?
Time is one of the most commonly used conversions. Depending on what you are converting between, it is also a good example of sometimes needing more than one conversion factor. How many minutes are there in two days?
How do you multiply the top and bottom of a number?
Multiply the top and bottom numbers in the ones place. In other words, multiply the bottom number’s far right digit by the top number’s far right digit. If your answer is two digits long (for instance, 28), carry the first digit of your answer (e.g., 2) above the digit in the hundreds place of the top number.