That's reletivly easy. All you need to do is the following:
(4 + 4 + 4) / 4 = 3
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(4+4)/4 + 4
(4+4+4)/(-4) = -3
4 × ((4 ÷ 4) + 4)=20
There are six fours in twenty-four.
One way to use four fours to make 25 is 4 + 4 + 4 + √4, which equals 25.