You're close, but the correct answer is 63.  Watch the short video below to see how we teach students to multiply by nine.

I recommend reading Volume one of the Learn Math Fast System.  That book will teach you how to multiply all single digit numbers, and you only have to memorize 11 of the answers.  Older students can complete that book in about a month.  Use the coupon code PT2026 to get 10% off your order.