What pressure is required to achieve a CO2 concentration of 4.8010-2 at 20C?

What is 21 squared x 33 sqared times 66 squared?

2,091,964,644How to work fast (without calculator)212* 332 * 662 = (21*33*66)2 = 45738221*33 = 693 (easy)693*66 = 45738693*0666*3 = 181 + 6*3 + 9*6 = 737 + 6*9 + 6*6 + 0*3 = 979 + 6*6 + 0*9 = 454 + 0*6 = 4457382 = 4252723282 = 1625490964101*2(3*8) = 480102*2(7*8) = 11200103*2(7*3) = 42000103*2(5*8) = 80000104*2(5*3) = 300000105*2(5*7) = 7000000104*2(4*8) = 640000105*2(4*3) = 2400000106*2(4*7) = 56000000107*2(4*5) = 4000000001625490964+ = 20919646440000000480000001120000000420000000080000000030000000070000000000640000000240000000560000000400000000