Think about the common number in 7 and 9 times table.
Think of the divisibility rule.
Which number out of the options can not divide both 810 and 90?
Write the multiples of 3 and 9.
Let us try to divide the numbers by each option one by one.
List all the numbers that can divide 24 and 72 both except 1.
Think of a number which can divide both the given numbers.
Could you say the 5 times table? What do you notice?
Let us list all the factors first.
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