There's no single "correct" way to say the number 1,302,710,452, as it depends on context and personal preference. However, here are several options, ranging from the most formal to the more casual:
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One billion, three hundred two million, seven hundred ten thousand, four hundred fifty-two: This is the most formal and grammatically correct way to pronounce the number. It's ideal for official settings or when maximum clarity is required.
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One point three billion: This is a more concise approximation, suitable for informal situations where precise figures aren't crucial. It loses detail but gains ease of communication.
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One billion, three hundred and two million, seven hundred and ten thousand, four hundred and fifty-two: This is another formal option, using "and" between the hundreds and tens/thousands, a style that is common in British English.
The best way to say it depends entirely on the situation. If you need to be precise, use the first option. If you're speaking casually, the shortened approximation is perfectly fine.
