Lower Elementary:
Question: The Moon is 3,500 km wide. The Earth is 12,700 km wide. How many km wider is the Earth than the Moon?
Answer: 9,200 km
Solution: To solve the problem, we want to set up a vertical equation, start at the ones place, and move left. We know that 0 – 0 = 0, so we can fill in the ones and tens places and move on to the hundreds. 7 hundred minus 5 hundred is 2 hundred, and 12 thousand minus 3 thousand is 9 thousand. Altogether, that makes 9,200 km.
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