Her answer is off by 1, because there was no year zero. For example, 1 AD is one year after 1 BC, not two years after.Or in modern notation, 1 CE and 1 BCE.
I notice she gave instructions to “add” rather than to “subtract a negative number”. Many of my college calculus students cannot solve a word problem, “Something happened 4568 years ago. What was the date of that something?” (not even worrying about year zero here, within ten years would be fine).
Her answer is off by 1, because there was no year zero. For example, 1 AD is one year after 1 BC, not two years after.Or in modern notation, 1 CE and 1 BCE.
I notice she gave instructions to “add” rather than to “subtract a negative number”. Many of my college calculus students cannot solve a word problem, “Something happened 4568 years ago. What was the date of that something?” (not even worrying about year zero here, within ten years would be fine).