simple its 45 you could do the multiplication math or you could just move the decimal one place to the right because 10 moves just once.
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45 multiplied by 45 is 2025
45,000 multiplied by 45 is 2,025,000.
2400, 300, 80 and 10
4.5*10 = 45 square metres.
They are in the same ratio 2:9 multiplied by 5 makes 2 x 5 = 10 9 x 5 = 45 so is 10:45