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.
Common multiples of 3 and 7 are numbers that are divisible by both 3 and 7. To find the common multiples up to 100, we need to find numbers that are multiples of both 3 and 7. The common multiples of 3 and 7 up to 100 are 21, 42, 63, and 84. These numbers are multiples of both 3 and 7 within the range of 1 to 100.
4,8,12,16,20
Just 77.
Just 56.
56 and 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.
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.
They are: 7 14 21 28 and 35
28 and 56
21 and 42 are.
5 of them.