← Doubling and Halving Cards you don't know will reappear later

You should create an account to save your progress. It only takes a minute!
new card

240 x 75

Click to see back →
new card

240 x 75

18,000

Half 240 to 120, and double 75 to 150. Then, half 120 again to 60, and double 150 again to 300. Then, 240(75) = 120(150) = 60(300) = 18000.

I knew this card I didn't know this card
You have mastered 0 out of 20 cards
You are reviewing 0 out of 20 cards
You are learning 0 out of 20 cards

Have feedback about this card? Please email help@magoosh.com