The number halfway between 18 and 21 can be found by taking the average of the two numbers. To do this, add 18 and 21 together to get 39, then divide by 2 to get 19.5. Therefore, the number halfway between 18 and 21 is 19.5.
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They are 16, 18 and 20.
The greatest common factor (GCF) of two numbers is the largest number that divides both numbers without leaving a remainder. To find the GCF of 18 and 21, you can list the factors of each number: 18 (1, 2, 3, 6, 9, 18) and 21 (1, 3, 7, 21). The common factors are 1 and 3, and the greatest common factor is 3.
45 over 18 as a mixed number = 21/2
45/18 = 21/2
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