36
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4.9 is equal to four and nine tenths, or 4 9/10
9
The number 9 is equal to 9 x 4 = 36 quarters, or 36/4.
16 + 9 + 4 + 1
No, subtraction is not commutative. If you take the expression 9 - 4, you can't rearrange it because 9 - 4 does not equal 4 - 9.