1 and 7.
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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
The common factor is 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
21
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
21
The number 7. 7 goes into 21 3 times; 7 goes into 49 7 times.
2 and 7
The common factor is 7.
21