The document provides solutions to three addition and subtraction problems involving measurements with significant figures. It subtracts 17.827 g and 1.30 g to get 16.53 g, adds 0.80 g and 1.300 g to get 6.10 g, and subtracts 12.92 g and 1.2 g to get 11.7 g. In each case, the number of significant figures in the final answer is determined by the least number of significant figures in the original measurements.

1. Add or subtract the following measurements. Be sure each answer you enter contains the correct
number of significant digits 17.827 g - 1.30 g .80 g 1.300 gg 12.92 g-1.2 g ??
Solution
Ans 1
In subtraction and addition final answer would contain the least significant figures after decimal.
Part a
17.827 = 3 significant figures after decimal
1.30 = 2 significant figures after decimal
17.827 g - 1.30 g = 16.527 g
Final answer after rounding up = 16.53 g ( 2 significant figures after decimal)
In scientific notation = 1.653 x 10^1 g
Part b
4.80 = 2 significant figures after decimal
1.300 = 3 significant figures after decimal
4.80 g + 1.300 g = 6.100 g
Final answer after rounding up = 6.10 g ( 2 significant figures after decimal)
Part C
12.92 = 2 significant figures after decimal
1.2 = 1 significant figures after decimal

2. 12.92 g - 1.2 g = 11.72 g
Final answer after rounding up = 11.7 g ( 1 significant figures after decimal)
In scientific notation = 1.17 x 10^1 g