13 is 26% of what number? 10 is 40% of what number? What percent of 400 is 72? 1% of what number is 7?

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You are solving for X so, you have 10/x = 40/100 (You are looking for the whole) So, then you can cross multiply or a method I find easy is the 'look across'  First: 10x100 = 1,000  Next: 1,000 = 40x  Then: 40/40 cancels out 40 but what you do to one side you have to do to the other, so 40/1,000 Final step is: 25 = X  Its the same set up with the other numbers you are just looking for a different part of the equation. Message me if you need more help (: 

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