1 x 2 = 2
Multiplication sentences. 2 x 6 3 x 4 2 x 2 x 3 are factor strings of 12
The factor strings for 12 is 6*2 , 2*2*3, 4*3 if you are doing a chart than you put the length is how long the problem.
2 x 7
2 x 5
2 x 7
4*2*2 is one
What are the factor strings of 120
2*6,4*3
2 x 2 x 13
2 x 2 x 13 = 52
840=2*2*2*3*5*7
Because there can be long or short factor strings.