To find the common multiples of 3 and 7 up to 70, we first need to determine the multiples of each number individually.
Multiples of 3 are: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69.
Multiples of 7 are: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70.
Next, we look for the numbers that appear in both lists. The common multiples of 3 and 7 within this range are:
- 21
- 42
- 63
So, the common multiples of 3 and 7 up to 70 are 21, 42, and 63.