Finding Common Multiples Using POPF
1) Write each number as a POPF
2) Compare, circle each PAIR between the numbers
3) CROSS OUT ONE from each pair
4) Multiply all remaining numbers to get your first CM
5) Multiply your FIRST CM by 2 and 3 to get the next 2
Ex: Find the first 3 Common Multiples of 18 and 24
1 & 2) 18 = 2 x 3 x 3
24 = 2 x 2 x 2 x 3
4 & 5) 2 x 2 x 2 x 3 x 3 = 72
72 x 2 = 144
72 x 3 = 216
Homework:
Find the first 3 common multiples for the following numbers:
a) 16, 21
e) 21, 36
b) 36, 96
f) 16, 88
c) 77, 88
d) 36, 63