Hey there!
3 * 10^2
= 3 * 10 * 10
= 3 * 100
= 300
AND
12 * 10^4
= 12 * 10 * 10 * 10 * 10
= 12 * 100 * 100
= 12 * 10,000
= 120,000
SIMPLIFYING the ANSWER
120,000 - 300
= 119,700
≈ 100,000
Therefore, your answer should be:
100,000
Good luck on your assignment & enjoy your day!
~Amphitrite1040:)