15x because 5 cant go into 15x look at it like this 5 is a bird and 15x is a bee birds and bees are not the same so you cant add them the answer is 15x-5 good luck
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5x10 = 5(5x5) = (5x5) + (5x5) = 50.
no becuse 5x5=25 and 5x115=575
no it is not it has to be like this for it to be a number sentence......... 5x5=25........P.S..25 is the answer
5x5 is 25 5x5 is 25 25x25 is 625
3x + 3x + 3x = 3* (3x) = 9x