What is the total number up to 400 in which 3 or 7 can divide by both?
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Answered by
0
Answer:
How many numbers between 1 and 400 are divisible by both 3 or 7?
1*3*7 = 21
2*3*7 = 42
3*3*7 = 63
4*3*7 = 84
5*3*7 = 105
6*3*7 = 126
7*3*7 = 147
8*3*7 = 168
9*3*7 = 189
10*3*7 = 210
11*3*7 = 231
12*3*7 = 252
13*3*7 = 273
14*3*7 = 294
15*3*7 = 315
16*3*7 = 336
17*3*7 = 357
18*3*7 = 378
19*3*7 = 399
So there are 19 numbers between 1 and 400 divisible by both.
Oh by the way you could just do 400/(21) = 19.04 which would tell you faster
Answered by
3
Answer:
1*3*7 = 21
2*3*7 = 42
3*3*7 = 63
4*3*7 = 84
5*3*7 = 105
6*3*7 = 126
7*3*7 = 147
8*3*7 = 168
9*3*7 = 189
10*3*7 = 210
11*3*7 = 231
12*3*7 = 252
13*3*7 = 273
14*3*7 = 294
15*3*7 = 315
16*3*7 = 336
17*3*7 = 357
18*3*7 = 378
19*3*7 = 399
So there are 19 numbers between 1 and 400 divisible by both.
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