Question

(4) (4.23×10³)−(9.56×10²)
(6) (7×10⁸)−(4×10⁶)

Explanation:

Step1: Rewrite numbers in standard form

For $(4.23\times10^{3}) - (9.56\times10^{2})$, we have $4.23\times10^{3}=4230$ and $9.56\times10^{2} = 956$.

Step2: Perform subtraction

$4230-956 = 3274$.

For $(7\times10^{8})-(4\times10^{6})$, rewrite $7\times10^{8}=700000000$ and $4\times10^{6}=4000000$.

Step3: Perform subtraction

$700000000 - 4000000=696000000$.

Answer:

$(4.23\times10^{3})-(9.56\times10^{2}) = 3274$
$(7\times10^{8})-(4\times10^{6})=696000000$