6. 63475 + 32486 = 95,961 --> 2 sig figures --> 96,000
7. 150/355 = 0.4225352112676056 --> 1 sig figure --> 0.4
8. 670616629 * 1.6 -> 1,072,986,606.4/1000 -> 1,072,986.6064 -> 1 sig figure -> 1,000,000 x X X x X X x X X x X X x X X x X X X 9. (to 1 sig figure)
a) 0.3941*196 / 4.796
i) 0.4*200 / 5 = 80 / 5 = 16
ii) 0.3941*196 = 77.2436 / 4.796 = 16.10583819849875
iii) My estimate is close to my accurate answer, so my accurate answer is probably correct.
b) 4732*9176 / 19.5166
i) 5000 * 9000 / 20 = 45,000,000 / 20 = 2,250,000
ii) 4732 * 9176 / 19.5166 = 43,420,832 / 19.5166 = 2,224,815.387926176
iii) My estimate is close to my accurate answer, so my accurate answer is probably correct.
c) 2.764 * 84.695 / 9.687-4.19
i) 3 * 80 / 10-4 = 240/6 = 40
ii) 2.764 * 84.695 / 9.687-4.19 = 234.09698 / 5.497 = 42.5863161724577
iii) My estimate is close to my accurate answer, so my accurate answer is probably correct.
d) 58432*0.08 / 0.2*348
i) 60,000 * 0.08 / 0.2 * 300 = 4800 / 60 = 80
ii) 58432*0.08 / 0.2*348 = 4,674.56/69.6 = 67.1632183908046
iii) My estimate is close to my accurate answer, so my accurate answer is probably correct.