수학 트릭(암산 연습)

수학 트릭:

[✔] x + y

[✔] x - y

[✔] x * y

[✔] x / y

[✔] x * 11

[✔] x * x

x = 15, 25, 35, 45, 55, 65 ..

[✔] x * 5

[✔] x * 9

[✔] x * 4

[✔] x / 5

[✔] 1000 - x

[✔] x * y

y = 2, 4, 8

[✔] 2 ^ x

[✔] x + y

y = 91 ~ 109, 191 ~ 209, 291 ~ 309 ..

[✔] x - y

y = 91 ~ 109, 191 ~ 209, 291 ~ 309 ..

[✔] x * y

x,y = 10 ~ 19

[✔] x * x

x = 11 ~ 99

[✔] x1x2 * y1y2

x1 = y1 = 1 ~ 9, x2 + y2 = 10

23 * 27, 59 * 51, 37 * 33, 68 * 62 ..

[✔] x * x

x = 50 ~ 59

[✔] x * x

x = 40 ~ 49

[✔] x * y

x,y = 11, 21, 31, 41, 51, 61, 71, 81, 91

[✔] x% -> y

[✔] x * x

x = 100 ~ 109

Math Tricks 무료 버전에는 타사 광고가 포함됩니다.

The app uses the following APIs and libraries:

* MPAndroidChart - created by Philipp Jahoda

* ColorPIcker - created by Piotr Adamus