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The two values are equivalent in that they both represent around 4/10ths. However, 0.40 has one more significant figure, making it more precise than 0.4. Do not confuse "equivalent" with "equal", mathematically speaking. If something is equal, it is also equivalent. But if something is equivalent, it isn't necessarily equal. In this case, 0.4 is equivalent to 0.40, but 0.4 may not equal 0.40; it may have a rounding error making it unequal to 0.40. I hope this isn't too confusing for you!

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Q: 0.4 and 0.40 is equivalent not equivalent?
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