To write this in a factor rainbow, a one is written on the left side and a 45 on the right with an arc drawn between them. A three is then written to the right of the one with 15 written to the left of 45. An arc in a different color should join these two digits. Finally, 5 and nine are written inside the other factors, joined by a different-colored arc. The finished product is a rainbow, displaying the factors for 45.
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Since 45 is a factor of 270, it is automatically the GCF.
3 is a common factor of 57and 45.
because 9 times 5 = 45
The GCF is 45.
The greatest common factor of 45 and 320 is 5.