How many stars are in our galaxy?, about 10 billion, about 100 billion, about 50 billion, about 500 billion, How many seconds in a year?, about 30 million, about 20 million, about 10 million, about 20 million, What two whole, positive numbers that have a one-digit answer when multiplied and a two-digit answer when added?, 2 and 5, 1 and 9, 6 and 4, 1 and 1, How many years since Earth was formed?, about 6 billion, about 4.6 billion, about 5.6 million, about 6.4 billion, How many kilometres around the Equator?, about 60,000, about 50,000, about 30,000, about 40,000, How many zeros at the end of a trillion?, 6, 13, 10, 12

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