Practice problems adding and subtracting significant figures
1. 5.67 + 3.43 = 9.10 (round to 3 significant figures)
2. 8.921 - 2.35 = 6.57 (round to 3 significant figures)
3. 12.5 + 3.12 = 15.6 (round to 3 significant figures)
4. 6.45 - 1.2 = 5.2 (round to 2 significant figures)
5. 150 + 25.3 = 175 (round to 2 significant figures)
6. 2.34 + 5.6789 = 7.02 (round to 3 significant figures)
7. 9.81 - 3.4 = 6.41 (round to 3 significant figures)
8. 23.6 + 17.8 = 41.4 (round to 2 significant figures)
9. 3.14 - 0.987 = 2.15 (round to 3 significant figures)
10. 75.6 + 22.94 = 98.5 (round to 3 significant figures)