88 + 8/8 = 88 +1 = 89
With a bit of a cheat: 88 + 8/8 = 89
89 = 88 + (8 / 8)
979 - without using a calculator !
22 x 89 = 356
4+4+4-40 = 11
use the digit 8 four time to make 89
88 + 8/8 = 89
88 + 8/8 = 88 +1 = 89
With a bit of a cheat: 88 + 8/8 = 89
89 = 88 + (8 / 8)
88 + 8/888 + 8/8 = 89
Actinium-89 has 52 neutrons. This is calculated by subtracting the atomic number (which is 89 for Actinium) from the mass number (which is 89 for Actinium-89).
By using cheat code.
979 - without using a calculator !
1+2+34+5 = 3 + 81 + 5 = 84 + 5 = 89 ■
No four consecutive whole numbers have a sum of 360. 88 + 89 + 90 + 91 = 358 . . . too small 89 + 90 + 91 + 92 = 362 . . . too big