價格：免費
更新日期：2015-01-19
檔案大小：19 MB
目前版本：2.1
版本需求：需要 iOS 6.0 或以上版本。與 iPhone、iPad 及 iPod touch 相容。
支援語言：英語
Do you want to do quick calculations for large numbers ? Are you getting less grades in maths ? Do you work in financial business ? Do you want to be a trader ?
If YES, this is the perfect app for you !
This app contains great tricks to do calculations such as multiplication, squaring, division, subtraction, addition easily and quickly. Use this app as a pocket guide to improve your calculation skills. Boast and show your newly acquired skills to friends and colleagues !
The app also contains quiz to practice and test your skills. So go head buy the app, learn the tricks and practice your newly acquired skills !
Trick : Multiplication by 6
1.Add half of the neighbor to each digit.
2.If the starting digit is odd, add 5.
Example: 6 × 357 = 2142
Working right to left, 7 has no neighbor, add 5 (since 7 is odd) = 12. Write 2, carry the 1.
5 + half of 7 (3) + 5 (since the starting digit 5 is odd) + 1 (carried) = 14. Write 4, carry the 1.
3 + half of 5 (2) + 5 (since 3 is odd) + 1 (carried) = 11. Write 1, carry 1.
0 + half of 3 (1) + 1 (carried) = 2. Write 2.
支援平台：iPhone, iPad