7 x 3
How about: 3*7 = 21 or 1*21 = 21
1, 3, 7, 9, 21 and 63: 1 x 63, 3 x 21, 7 x 9
The three numbers that can be multiplied to get 252 are 3, 4, and 21. When you multiply these together (3 × 4 × 21), the product is 252. Other combinations are possible as well, such as 2, 6, and 21, or 2, 2, and 63.
1, 3, 7, 21: 1 x 21, 3 x 7
7 x 3
3 & 49; 7 & 21
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.
Factors are numbers you can multiply together to get another number. 21: (1, 21) (3, 7)
How about: 3*7 = 21 or 1*21 = 21
1, 3, 7, 9, 21 and 63: 1 x 63, 3 x 21, 7 x 9
3 x 7 1 x 21
1 x 63, 3 x 21, 7 x 9
1, 3, 7, 21: 1 x 21, 3 x 7
1 x 21, 3 x 7
What you do is multiply all 3 numbers together.
7 & 3