The factors of 90 are:
1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
The factors of 120 are:
1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120
The GCF of 90 and 120 is 30. The factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, and 90. The factors of 120 are 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, and 120. The GCF of 90 and 120 is 30.
The GCF of 90 150 and 120 is 30. This leaves you with 3, 5 and 4. There are no further common factors between the 3 remaining numbers.
30, 60, 90, 120, 150
LCM for 90 and 120 is 360.
15 30 45 60 75 90 105 120
Factors - 1, 2, 3, 15, 30 Multiples 0, 30, 60, 90, 120, 150...
They are 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 30, 40, 45, 60, 90 and 120.
Factors of 90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90.Factors of 60: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60.Factors of 120: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120.GCF (90, 60, 120) = 30
(120 + 60) ÷ 2 = 90
30, 60, 90, 120, 150, 180, 210 +30 . . .
105.105 is half way between 90 and 120.
The percentage reduction = (120 - 90) x 100 / 120 = 30 x 100/120 = 25%