7
The answer is 7. The equation is x+14=21, so you would find x by doing 21-14=7 x=7
14. If you have the numbers in order like so: 7,9,11,14,21 you can see that 21 is the greater number. You then subtract 21 from the smallest number, 7, and you get 14.
The answer is 1414
2 and 7
7
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, 2, 3, 6, 7, 14, 21, 42
The answer is 7. The equation is x+14=21, so you would find x by doing 21-14=7 x=7
14. If you have the numbers in order like so: 7,9,11,14,21 you can see that 21 is the greater number. You then subtract 21 from the smallest number, 7, and you get 14.
21
The answer is 1414
2 and 7
The number 7. 7 goes into 21 3 times; 7 goes into 49 7 times.
The common factor is 7.
21
The number 7