Improper integrals worksheet

Replace the problem end with a variable, integrate, and take the limit. If the limit is a number the integral converges to it; if not, it diverges.

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Pick more than one for a sheet that mixes them.



Sigma Prep · sigmaprep.io/worksheets Name Improper Integrals Date Period Evaluate each integral or show that it diverges. $\int_{0}^{\infty} 4 e^{- x} d x$ $\int_{0}^{1} \frac{1}{x^{2}} d x$ $\int_{0}^{1} \frac{1}{x^{\frac{1}{3}}} d x$ $\int_{0}^{\infty} 6 e^{- 3 x} d x$ $\int_{1}^{\infty} \frac{1}{x^{3}} d x$ $\int_{0}^{1} \frac{1}{x^{\frac{2}{3}}} d x$ $\int_{0}^{1} \frac{1}{x^{\frac{1}{2}}} d x$ $\int_{1}^{\infty} \frac{3}{x^{3}} d x$ $\int_{1}^{\infty} \frac{1}{x} d x$ $\int_{1}^{\infty} \frac{3}{x^{4}} d x$ $\int_{0}^{\infty} 5 e^{- 3 x} d x$ $\int_{1}^{\infty} \frac{3}{x^{2}} d x$ $\int_{0}^{\infty} 2 e^{- x} d x$ $\int_{1}^{\infty} \frac{4}{x^{4}} d x$ $\int_{1}^{\infty} \frac{3}{x^{5}} d x$ $\int_{0}^{\infty} 6 e^{- 5 x} d x$ $\int_{1}^{\infty} \frac{2}{x^{5}} d x$ $\int_{1}^{\infty} \frac{1}{\sqrt{x}} d x$ $\int_{1}^{\infty} \frac{1}{x^{5}} d x$ $\int_{0}^{\infty} 4 e^{- 3 x} d x$ Free math worksheets at sigmaprep.io/worksheets© 2026 Sigma Prep

Sigma Prep · sigmaprep.io/worksheets

Name

Improper Integrals

Date Period

Evaluate each integral or show that it diverges.

$\int_{0}^{\infty} 4 e^{- x} d x$
$\int_{0}^{1} \frac{1}{x^{2}} d x$
$\int_{0}^{1} \frac{1}{x^{\frac{1}{3}}} d x$
$\int_{0}^{\infty} 6 e^{- 3 x} d x$
$\int_{1}^{\infty} \frac{1}{x^{3}} d x$
$\int_{0}^{1} \frac{1}{x^{\frac{2}{3}}} d x$
$\int_{0}^{1} \frac{1}{x^{\frac{1}{2}}} d x$
$\int_{1}^{\infty} \frac{3}{x^{3}} d x$
$\int_{1}^{\infty} \frac{1}{x} d x$
$\int_{1}^{\infty} \frac{3}{x^{4}} d x$
$\int_{0}^{\infty} 5 e^{- 3 x} d x$
$\int_{1}^{\infty} \frac{3}{x^{2}} d x$
$\int_{0}^{\infty} 2 e^{- x} d x$
$\int_{1}^{\infty} \frac{4}{x^{4}} d x$
$\int_{1}^{\infty} \frac{3}{x^{5}} d x$
$\int_{0}^{\infty} 6 e^{- 5 x} d x$
$\int_{1}^{\infty} \frac{2}{x^{5}} d x$
$\int_{1}^{\infty} \frac{1}{\sqrt{x}} d x$
$\int_{1}^{\infty} \frac{1}{x^{5}} d x$
$\int_{0}^{\infty} 4 e^{- 3 x} d x$



Sigma Prep · sigmaprep.io/worksheets Name Improper IntegralsAnswer keyVersion 1 Date Period Evaluate each integral or show that it diverges. $\int_{0}^{\infty} 4 e^{- x} d x$ $4$ $\int_{0}^{1} \frac{1}{x^{2}} d x$ Diverges $\int_{0}^{1} \frac{1}{x^{\frac{1}{3}}} d x$ $\frac{3}{2}$ $\int_{0}^{\infty} 6 e^{- 3 x} d x$ $2$ $\int_{1}^{\infty} \frac{1}{x^{3}} d x$ $\frac{1}{2}$ $\int_{0}^{1} \frac{1}{x^{\frac{2}{3}}} d x$ $3$ $\int_{0}^{1} \frac{1}{x^{\frac{1}{2}}} d x$ $2$ $\int_{1}^{\infty} \frac{3}{x^{3}} d x$ $\frac{3}{2}$ $\int_{1}^{\infty} \frac{1}{x} d x$ Diverges $\int_{1}^{\infty} \frac{3}{x^{4}} d x$ $1$ $\int_{0}^{\infty} 5 e^{- 3 x} d x$ $\frac{5}{3}$ $\int_{1}^{\infty} \frac{3}{x^{2}} d x$ $3$ $\int_{0}^{\infty} 2 e^{- x} d x$ $2$ $\int_{1}^{\infty} \frac{4}{x^{4}} d x$ $\frac{4}{3}$ $\int_{1}^{\infty} \frac{3}{x^{5}} d x$ $\frac{3}{4}$ $\int_{0}^{\infty} 6 e^{- 5 x} d x$ $\frac{6}{5}$ $\int_{1}^{\infty} \frac{2}{x^{5}} d x$ $\frac{1}{2}$ $\int_{1}^{\infty} \frac{1}{\sqrt{x}} d x$ Diverges $\int_{1}^{\infty} \frac{1}{x^{5}} d x$ $\frac{1}{4}$ $\int_{0}^{\infty} 4 e^{- 3 x} d x$ $\frac{4}{3}$ Free math worksheets at sigmaprep.io/worksheets© 2026 Sigma Prep

Sigma Prep · sigmaprep.io/worksheets

Name

Improper IntegralsAnswer keyVersion 1

Date Period

Evaluate each integral or show that it diverges.

$\int_{0}^{\infty} 4 e^{- x} d x$ $4$
$\int_{0}^{1} \frac{1}{x^{2}} d x$ Diverges
$\int_{0}^{1} \frac{1}{x^{\frac{1}{3}}} d x$ $\frac{3}{2}$
$\int_{0}^{\infty} 6 e^{- 3 x} d x$ $2$
$\int_{1}^{\infty} \frac{1}{x^{3}} d x$ $\frac{1}{2}$
$\int_{0}^{1} \frac{1}{x^{\frac{2}{3}}} d x$ $3$
$\int_{0}^{1} \frac{1}{x^{\frac{1}{2}}} d x$ $2$
$\int_{1}^{\infty} \frac{3}{x^{3}} d x$ $\frac{3}{2}$
$\int_{1}^{\infty} \frac{1}{x} d x$ Diverges
$\int_{1}^{\infty} \frac{3}{x^{4}} d x$ $1$
$\int_{0}^{\infty} 5 e^{- 3 x} d x$ $\frac{5}{3}$
$\int_{1}^{\infty} \frac{3}{x^{2}} d x$ $3$
$\int_{0}^{\infty} 2 e^{- x} d x$ $2$
$\int_{1}^{\infty} \frac{4}{x^{4}} d x$ $\frac{4}{3}$
$\int_{1}^{\infty} \frac{3}{x^{5}} d x$ $\frac{3}{4}$
$\int_{0}^{\infty} 6 e^{- 5 x} d x$ $\frac{6}{5}$
$\int_{1}^{\infty} \frac{2}{x^{5}} d x$ $\frac{1}{2}$
$\int_{1}^{\infty} \frac{1}{\sqrt{x}} d x$ Diverges
$\int_{1}^{\infty} \frac{1}{x^{5}} d x$ $\frac{1}{4}$
$\int_{0}^{\infty} 4 e^{- 3 x} d x$ $\frac{4}{3}$

How to do these

$\int_{1}^{\infty} \frac{1}{x^{2}} d x$

The integral from 1 to b is 1 − 1/b.
As b grows, 1/b goes to 0.

The answer is $1$ .

Where students go wrong

Treating 1/x like 1/x². Both shrink to zero, but the area under 1/x out to infinity is infinite: the power has to be greater than 1 at infinity.

Also called convergent and divergent integrals or infinite limits of integration.

Questions about these worksheets

Yes. Every improper integrals sheet is free to print and free to download as a PDF. There is no account to make, no email to hand over and no limit on how many you take.

Yes. The answer key prints on a second page, and you can choose whether it shows each question beside its answer or just the answers in a list.

Yes. Print straight from the page, or download the PDF and print that. The sheet is laid out for paper rather than squeezed off a screen, so there is room to work under each question, and the answer key comes out on its own page.

Calculus is usually taken around 12th grade or a first college course, though schools vary and plenty of students meet it earlier or later. Pick the difficulty rather than the grade: the easy level suits a first lesson on it, the hard level suits review before a test.

Yes, as many as you like. The questions are built fresh each time rather than picked from a fixed set of files, so pressing Generate gives a new sheet. That is what you want for a second class, a retake, or two students sitting next to each other.

That is the closest comparison, and Kuta Software is good software. It is also paid software you install on a computer. These worksheets run in a browser tab for free, with no account and nothing to install. Like Kuta, the improper integrals questions are generated when you ask for them rather than pulled from a fixed set of files, so two classes never get the same sheet, and the answer key comes with it.

Yes. There are three levels, and you can tick more than one for a sheet that mixes them, in which case the questions come out easiest first. The harder levels are not just larger numbers: they ask for something the easy ones do not.

Treating 1/x like 1/x². Both shrink to zero, but the area under 1/x out to infinity is infinite: the power has to be greater than 1 at infinity.

Improper integrals worksheet

Select your difficulty

Improper Integrals

Improper IntegralsAnswer keyVersion 1

How to do these

Where students go wrong

Questions about these worksheets

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