Multiples of 21 are numbers that can be divided evenly by 21. The first few multiples of 21 are 21, 42, 63, 84, 105, and so on. To find more multiples of 21, you can continue adding 21 to the previous multiple.
3 and 7 multiplies to 21 and equals to 10
21
-10
131
-81
33
54
-21
-21
-67
The numbers are: 6 and -27
19 + 2 = 21 19 x 2 = 38