How to calculate 456 + 299 simply And 321-198, 12 * 1.25, 1800 * 25, 73.75 - (8, 75-4.3)

How to calculate 456 + 299 simply And 321-198, 12 * 1.25, 1800 * 25, 73.75 - (8, 75-4.3)

456+299=456+300-1=756-1=755
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