7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98.
Common multiples result from comparing one number to at least one other. You've neglected to mention that other number. Multiples of 21 in that range are 21, 42, 63 and 84.
Oh, dude, you want common multiples of 3 and 7 up to 100? Well, let me break it down for you. The common multiples of 3 and 7 are numbers that both 3 and 7 can divide evenly into. So, the common multiples of 3 and 7 up to 100 are 21, 42, 63, and 84. Like, that's it.
4,8,12,16,20
Just 77.
56 and 56
Just 56.
77. Multiples up to 12 are-7:7,14,21,21,35,42,49,56,63,70,77,84.11:11,22,33,44,55,66,77,88,99121,132.
28 and 56
21 and 42 are.
5 of them.
They are: 7 14 21 28 and 35
Oh, dude, multiples of 7 up to 5000? Let me casually drop some knowledge on you. So, multiples of 7 are numbers that 7 can be multiplied by to get the number, like 7, 14, 21, and so on. You can find them by just counting by 7s up to 5000. Easy peasy, lemon squeezy.