3×0.3–0.5

-0.1

To solve the expression 3 × 0.3 - 0.5, follow these steps:

Step 1: Multiply 3 by 0.3:
3 × 0.3 = 0.9

Step 2: Subtract 0.5 from the result obtained in step 1:
0.9 - 0.5 = 0.4

Therefore, the final answer is 0.4.