Subtract: ¹⁵/₆ - ¹²/₉ =

Question

Quizplus · Accepted Answer

Step 1: Find the Least Common Denominator (LCD). There are two ways we can do this:
Method 1: Find the first common multiple. List out all multiples of each denominator and find the first common one.
Multiples of 6: 6, 12, 18…
Multiples of 9: 9, 18…
Therefore, LCD is 18.
Method 2: Prime Factors. The LCD will be the product of the largest multiple of each prime that appears on at least one list.
Prime factors of 6: 2, 3.
Prime factors of 9:  3, 3.
So, the LCD is 2 x 3 x 3 = 18.
Step 2: Make the denominators the same as the LCD.
 11ec0fda_98ca_fdda_a67f_0b98efc2f56f_NR0004_00 Step 3: Simplify. The denominators are now the same.
 11ec0fda_98ca_fddb_a67f_a3b74c8f7386_NR0004_00 Step 4: Join the denominators.
 11ec0fda_98ca_fddc_a67f_5d2215a22801_NR0004_00 Step 5: Simplify.
 11ec0fda_98ca_fddd_a67f_f3d7867bff35_NR0004_00 Step 6: Convert to mixed number.
 11ec0fda_98ca_fdde_a67f_7929af40e660_NR0004_00 Step 7: Simplify.
 11ec0fda_98ca_fddf_a67f_afc85a203111_NR0004_00

Subtract: 15/6 - 12/9 =

Subtract: ¹⁵/₆ - ¹²/₉ =