0'0786 x 10^12
(2'3 x 10^-9) + (78 x 10^-7)
(2'3 x 10^8) x (2'7 x 10^6)
(6'697 x 10^-4) - (2'72 x 10-8)
(1'5 x 10^8)/(0'2 x 10^2)
76800000000
389000000000 + 23900000000
5670000000-120000000
45000000 + 235000000
870000 x 38000
2'8 x 10^8
4'129 x 10^11
621000000000000
5'55 x 10^9
3'306 x 10^10
0'0000078023
0'0006696728
7'68 x 10^10
78600000000
7500000