Question

Perform each of the following operations as indicated. Express your answers to the correct number of significant figures and unit.

1. 5 x 10–7 kg + 3 x 10–7 kg


2. 4 x 105 kg + 6 x 105 kg




3. 1.66 x 1019 kg + 2.30 x 1019 kg




4. 7.2 x 10–12 kg - 2.6 10–12 kg




5. 3.8 x 10–12 m2 - 1.90 x 10–11 m2


6. 2.26 x 10–18 m2 - 1.8 x 10–18 m2

Answer 1

1. 70 with 1 sig fig
2. 1000 with 1 sig fig
3. 4040 with 3 sig fig
4. I’m not certain if that second part is 2.6X10-12 but if so, the answer is 20 with 1 sig fig