Well in standard form 2.4 x 10 (-3 power) is .0024. This is because the exponent is negative.
Addition:
1.2 x 10^-3 + 1.2 x 10^-3
Subtraction:
10 x 10^3 - 7.6 x 10^-3
To get the answer you can simply just add and subtract to get 2.4.
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