The number is 14.
2 56 4 28 8 14
21
The greatest common factor is the highest number that divides exactly into two or more numbers.14: 1, 2, 7, 1428: 1, 2, 4, 7, 14, 2863: 1, 3, 7, 9, 21, 63The GCF of 14, 28 and 63 is 7.The GCF is 7.
0.75 21/28 is the same as 3/4 (seven divides both 21 and 28) and three quarters is 0.75
1,764
The common multiples of 21 and 28 are 84, 168, 252, 336, ... and so on, never ending; so there is no real Highest Common Multiple.Do you mean:Highest Common Factor - the highest number which divides both 21 and 28 which is 7; orLowest Common Multiple - the lowest number which is a multiple of both 21 and 28 which is 84.
When figuring out what number goes both into 21 and 28, you should look at the factor paris. 21: 1 x 21, 3 x 7 28: 1, 28, 2 x 14, 4 x 7 7 goes into both 21 and 28.
1 and 7
14 and 21, and 21 and 28 are the number pairs between 15 and 30 that have 7 as their greatest common factor.
The number is 28.
GCF(14, 28, 21) = 7