Grade 8 Adding Numbers in Scientific Notation

Add. Give both numbers the same power of 10 first, then write the answer in scientific notation.

1. 1.(2.7 x 10^4) + (7.5 x 10^4) =
2. 2.(6.8 x 10^5) + (4.8 x 10^4) =
3. 3.(3.2 x 10^2) + (5.2 x 10^3) =
4. 4.(5.7 x 10^6) + (5.3 x 10^7) =
5. 5.(7.5 x 10^9) + (4.2 x 10^9) =
6. 6.(5.6 x 10^5) + (2.2 x 10^4) =
7. 7.(1.1 x 10^6) + (9.6 x 10^6) =
8. 8.(3.5 x 10^9) + (2.4 x 10^9) =
9. 9.(7.9 x 10^8) + (7.8 x 10^9) =
10. 10.(4.7 x 10^8) + (8.9 x 10^9) =
11. 11.(5.4 x 10^8) + (6.5 x 10^7) =
12. 12.(3.1 x 10^5) + (1.9 x 10^6) =
13. 13.(7.2 x 10^4) + (2.0 x 10^4) =
14. 14.(3.5 x 10^3) + (5.8 x 10^3) =
15. 15.(8.8 x 10^2) + (5.7 x 10^3) =
16. 16.(5.9 x 10^7) + (7.0 x 10^6) =