May I assume you mean both 3 and 7? Then we are looking for multiples of 21.
The smallest is 21 = 1 x 21.
The largest is 300 = 19 x 21.
So there are 19 of them.
If you mean divisible by 3 or 7, then we are looking to add the number of multiples of 3 and multiples of 7 and then subtracting the multiples of both (so we do not count them twice).
Smallest multiple of 3 is 3 = 1 x 3. Largest multiple of 3 is 399 = 133 x 3. There are 133 of them.
Smallest multiple of 7 is 7 = 1 x 7. Largest multiple of 7 is 399 = 57 x 7. There are 57 of them.
Step-by-step explanation:
7×3=21
7×9=63
52×3=156
21×3=63
Answer:
May I assume you mean both 3 and 7? Then we are looking for multiples of 21.
The smallest is 21 = 1 x 21.
The largest is 300 = 19 x 21.
So there are 19 of them.
If you mean divisible by 3 or 7, then we are looking to add the number of multiples of 3 and multiples of 7 and then subtracting the multiples of both (so we do not count them twice).
Smallest multiple of 3 is 3 = 1 x 3. Largest multiple of 3 is 399 = 133 x 3. There are 133 of them.
Smallest multiple of 7 is 7 = 1 x 7. Largest multiple of 7 is 399 = 57 x 7. There are 57 of them.
133 + 57 – 19 = 171.