1 x 21, 3 x 7
To find the LCM of two numbers you need to multiply them together and then divide by the HCF. In this case, the numbers are coprime and so the HCF will be 1. Therefore was just have to multiply the numbers together: 7x3 = 21 And so the LCM of 7 and 3 is 21.
63
Any number can be multiplied by 21
The numbers that multiply to 294 and add to 7 are 14 and -21. When you multiply 14 and -21, you get 294 (14 * -21 = -294). When you add them together, 14 + (-21) equals 7 (14 - 21 = -7).
How about: 3*7 = 21 or 1*21 = 21
21 multiplies to 21 to make it 441
21*5 is the answer
3 x 7 1 x 21
57
21
21*6=126
2*21 = 42