Trick Description

Have you ever noticed that any fixed rational number when multiplied by "9" or "3", the sum of the digits of the multiplication result can be divided by "9" or "3" respectively?

In this module you will learn why this is so and how to make use of this principle to solve different problems.

• Prerequisites:
  • High school level maths knowledge
• Duration:
  • 20 mins (estimated time to complete excluding exercises)
• Subscription Prices:
  • 1 Month - AUD$30
    AUD$  to ANGARSAUDBGNBHDBNDBOBBRLBWPCADCHFCLPCNYCOPCSDCZKDKKEEKEGPEURFJDGBPHKDHNLHRKHUFIDRILSINRISKJPYKRWKWDKZTLKRLTLMADMURMXNMYRNOKNPRNZDOMRPENPHPPKRPLNQARRONRUBSARSEKSGDSITSKKTHBTRYTTDTWDUAHUSDVEBZAR   

  • Sign up for Fixed Rational Numbers when Multiplied by "9" or "3" now!

• Recommendation:
  • Learners of high school level and above who wants to improve their problem solving maths skills for exams and competitions

*All online transactions are handled in Australian dollars. Prices in other currencies are shown as a guide only. See more details.