209 228 247 266 285 304 323 342 361 380 399
19.
20,25,30,35,40,45
20, 25, 30, 35, 40, 45.
The answer depends on what tables you know. For a very naive user: 220 * 19 = (200 + 20)*(20 - 1) = 200*20 - 200*1 + 20*20 - 20*1 = 4000 - 200 + 400 - 20 = 4180 For more proficient users: 220 * (20 - 1) = 220*20 - 220*1 = 4400 - 220 = 4180 or (200 + 20)*19 = 200*19 + 20*19 = 3800 + 380 = 4180
19
19.
Positive integer multiples of 23 which lie between 400 and 499 are: 23 x 18 = 414 23 x 19 = 437 23 x 20 = 460 23 x 21 = 483
There are 19 that fall between 1 and 100.
20,25,30,35,40,45
There are 15 multiples of 19 that fall between one and 300: 19, 38, 57, 76, 95, 114, 133, 152, 171, 190, 209, 228, 247, 266, 285.
Multiples of 7: 7, 14, 21, 28, 35,... Multiples of 19: 19, 38, 57, 76, 95,...
They are: 21, 28, 35, 42 and 49
The common multiples of 16 and 19 are any multiple of 304.
20, 25, 30, 35, 40, 45.
400 multiplied by 19 is 7,600.
Multiples of 19 include 19, 38 and 57. For them to be common, they need to be compared to another set of multiples.
The answer depends on what tables you know. For a very naive user: 220 * 19 = (200 + 20)*(20 - 1) = 200*20 - 200*1 + 20*20 - 20*1 = 4000 - 200 + 400 - 20 = 4180 For more proficient users: 220 * (20 - 1) = 220*20 - 220*1 = 4400 - 220 = 4180 or (200 + 20)*19 = 200*19 + 20*19 = 3800 + 380 = 4180