45 tenths
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In the decimal number 4.5, the digit 4 represents 4 whole units, and the digit 5 represents 5 tenths. Therefore, there are 5 tenths in 4.5. Each digit's place value is determined by its position relative to the decimal point, with the first digit to the right of the decimal point representing tenths.
Well, honey, 45 is just a fancy way of saying 45.0, so technically you could say there are 450 tenths in 45. But if you want to keep it simple, just say there are 4.5 tenths in 45. Math is a piece of cake when you break it down like that!
4.5
45 minutes(0.75(75 tenths)is 75% of an hour or 3quarters 60 minutes divided by 4 multiplied by 3 = 45)
9/20 or .45
9/10 x 50 = 45