Because a Prime number only has two factors: one and the number itself.
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Yes. After the first factor pair. Ex.1x13,13x1
your opponent will get the point because there are only two options and you told the wrong answer.
When you circle a number in the factor game, the reason your opponent gets one point is because the number circled is considered the opponents as it is their choice to pick a number for you to solve. The prime numbers selected from the opponent\'s choice is considered your points in the Factor game according to the rules.
Their at the bottom of the tree because the hole point of a factor tree is to find the prime factorization of the number, so it would be at the bottom of the tree.
You need to add up the number of digits to the right of the decimal to find the number of digits in the answer. If the first factor has 2 digits to the right of the decimal point and the second factor has 3, the final answer will have 5 digits to the right of the decimal point.