It must be in the fourth grade

Can you be more specific? Let's see if this is 17 × 40 = 100-63 = 3.2 + 1.68 = 2.8 × 0.4 = 14-7.4 = 1.92 △ 0.04 = 0.32 × 500 = 0.65 + 4.35 = 10-5.4 = 4 △ 20 = 3.5 × 200 = 1.5-0.06 = 0.75 △ 15 = 0.4 × 0.8 = 4 × 0.25 = 0.36 + 1

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