Q: How can I make the number 4 using four sevens only?

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Four of them: 4 times 7 = 28

99 divided by 0.99

As a solution to the four fours problem (using the number four no more than four times to come up with the solution, 31 is equal to (4!+4)/4+4!

Google "Four Fours" and you will find a number of solutions, presented more comprehensively than we can.

How can you make $25.45 using the least number of bills and coins?

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7/.7 x 7/.7 = 10 x 10 = 100

((7+7)*7) - 7

Four of them: 4 times 7 = 28

You could go (7+7+7)7=147

eleven to the power of eleven

99 divided by 0.99

5*4+3+2

As a solution to the four fours problem (using the number four no more than four times to come up with the solution, 31 is equal to (4!+4)/4+4!

(8x8)=64

You divide 7 by 4 which is 1.75.

4! - 4 + 4/4

( ( 6 / 6 ) + 6) * 6