No, the only one that does is three. (1, 3, 7, 21)
1) You look for a common factor between the two numbers. Prime factorization can help here. 2) You divide both numbers by this factor. Three goes into both 21 and 33. 21 to 33 can be simplified to 7 to 11.
19, 20, 21
3,7
The numbers are 21, 22 and 23.
How many numbers less than 700 are divisible by both 15 and 21?
21 has only two factors , 3 and 7 Both are prime numbers, divisible only by itself and 1 So the third number must be .... 1 1 x 3 x 7 = 21 ( Of course this only applies, if we are talking about integers ;-) )
The numbers are 5, 7 and 9.
42 of them.
21
The LCM of both numbers is 168
28*3/4 = 21
(28 ÷ 4) × 3 = 21