What is the prime factorization of 72?

72 = 8 × 9 = 2³ × 3², which uses only prime factors.

A store marks up a $40 item by 15%. What is the new price?

15% of $40 is $6, so the new price is $40 + $6 = $46.

0.6 = 6/10 = 3/5 after simplifying by dividing numerator and denominator by 2.

Multiples of 4: 4, 8, 12… Multiples of 6: 6, 12… The smallest common multiple is 12.

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Which number is a perfect square?