Advanced Mathematics Primary 4 Factors and Multiples

Ravi lists all the common factors of 72 and 90. How many common factors do 72 and 90 have?

A 4
B 6
C 8
D 9
Show Worked Solution

Worked Solution

Step 1: List all factors of 72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72. Step 2: List all factors of 90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90. Step 3: Common factors (in both lists): 1, 2, 3, 6, 9, 18. Step 4: Count: 1, 2, 3, 6, 9, 18 = 6 common factors. Answer: 6.

Correct answer: 6

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