To find the GCF of 9 and 21, we will find the prime factorization of the given numbers, i.e. 9 = 3 × 3; 21 = 3 × 7. ⇒ Since 3 is the only common prime factor of 9 and 21. Hence, GCF (9, 21) = 3.
How do you find the second common multiple?
When working with three numbers, first multiply the two lowest numbers. For the second-highest number, find the product of the other two numbers and list that many multiples. Repeat for the lowest number.
What is the 2nd multiple of 9?
The first ten multiples of 9 are 9, 18, 27, 36, 45, 54, 63, 72, 81, 90. For the tens places, note that the number 9 can be thought of as 0 tens and 9 ones so the tens place has a 0. The tens place of 18 is 1.
Which is the least common multiple of 9 and 21?
21 = 7 x 3 , 9 = 3 x 3 ; for the Least Common Multiple (LCM), 21 already is a multiple of 7. 21 & 9 have a common factor of 3, so LCM = 21 x 3 = 63 What is the least common multiple of 9 10 12 and 21?
Which is the least common multiple of 9 10 12?
21 = 7 x 3 , 9 = 3 x 3 ; for the Least Common Multiple (LCM), 21 already is a multiple of 7. 21 & 9 have a common factor of 3, so LCM = 21 x 3 = 63 What is the least common multiple of 9 10 12 and 21? The Least Common Multiple (LCM) for 9 10 12 21 is 1,260.
What are the common multiples of 6 and 9?
Common multiples of 6 and 9 are numbers that both 6 and 9 can be divided into evenly with no remainder. To find the common multiples of 6 and 9, we compare the list of multiples of 6 with the list of multiples of 9 to see what they have in common. To create a list of multiples of 6, we multiply 6 by 1, 6 by 2, and so on like this: 6 x 1 = 6
How do you find multiples of two numbers?
We can find the common multiples of two or more numbers by listing the multiples of each number and then finding their common multiples. For example, to find the common multiples of 3 and 4, we list their multiples and then find their common multiples. Multiples of 3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36.
