Free 8th Grade Math Exercises Online

Exercise example N°1110 :

Use yellow numbers and blue arithmetic operators to calculate the target number.

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Countdown is an arithmetic exercise that allows you to practice quick mental calculation in an efficient way. The goal is to reconstruct an integer using other integers and basic arithmetic operations (+,-,*,/).

Exercise example N°1311 :

Expand the following expression `-10*(-12)`.

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The objective of this algebraic calculus exercise is to expand an algebraic expression.

Exercise example N°1312 :

Put in the form `a*1/b` the following fraction `19/6`

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The objective of this exercise is to put the product of a number by the inverse of another number in fraction form.

Exercise example N°1313 :

Give a value approximating to 0.1 of the following fraction `19/6`.

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This exercise allows to practice calculations with decimals, the goal is to give the approximate value of a fraction to one decimal place.

Exercise example N°1314 :

Simplify the following fraction `(3*3)/(8*3)`.

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The objective of this activity is to simplify a fraction whose numerator and denominator are composed of products of whole numbers.

Exercise example N°1315 :

Put in the form of an irreducible fraction: `-5*8/(9*6)`.

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This exercise allows to learn how to simplify a fraction whose numerator and denominator are composed of product of relative numbers.

Exercise example N°1316 :

Put in the form of an irreducible fraction: `((2)/(-4))/((6)/(9))`.

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The objective of this exercise is to simplify a fraction whose numerator and denominator are fractions, in other words, a fraction of fractions.

Exercise example N°1317 :

Write the following product as a power of 10: `10^(-10)*10^(-3)`.

power Numbers 8th Grade

The objective of this numerical computation exercise is to write in the form of a power of 10 a product of numbers.

Exercise example N°1318 :

Write the following product as a power of 10: `(10^(-6))^(-9)`.

power Numbers 8th Grade

The purpose of this exercise is to practice finding the writing in the form of a power of 10, of a number raised to a power.

Exercise example N°1319 :

Write using scientific notation the following number: `-0.7539046`.

power Numbers 8th Grade

The purpose of this corrected math exercise is to write a number with scientific notation.

Exercise example N°1321 :

Write in the form of a single power the following expression: `20^(-3)*20^(6)`.

power Numbers 8th Grade

This exercise allows to practice putting a product of numbers in the form of a power.

Exercise example N°1322 :

With what value must the question mark be replaced for the following equality to be true? `94^(-3)*94^(?)`=`94^(-8)`

power Numbers 8th Grade

The purpose of this math exercise is to complete an equality that involves powers.

Exercise example N°1324 :

Give a value approximated to `10^-1` of `sqrt(91)`.

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The objective of this exercise is to give an approximate value of a square root to one decimal place.

Exercise example N°1325 :

Simplify the following expression `1+5*z+2*z^2+5+4*z+z^2+4+2*z+5*z^2`.

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This exercise allows you to practice the techniques of simplifying algebraic expressions that contain a single letter.

Exercise example N°1326 :

Expand the following expression `(-4*a-8*b)*(5*a+3*b)`.

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The objective of this algebraic calculus exercise is to expand an algebraic expression.

Exercise example N°1327 :

Compute the following expression `2+x+9+4*y` for x=4 ,y=6.

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The objective of this exercise is to calculate an algebraic expression by replacing letters with a given value.

Exercise example N°1328 :

Compare the following two expressions `90/10` ... `27/10`.

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The objective of this solved exercise is to compare two fractions using the correct operator.

Exercise example N°1329 :

Give a frame to the nearest `10^-1` of the following fraction `25/4`.

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The objective of this math exercise is to frame a fraction using two decimal numbers.

Exercise example N°1330 :

I have a number, I add 27 to it, I subtract 22 from the result and I get 43, what is this number?

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The objective of this math exercise is to equate a simple problem to solve it.

Exercise example N°1331 :

Does the following table correspond to a proportionality table?

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The purpose of this exercise on proportionality is to check that a table is indeed a proportionality table.

Exercise example N°1332 :

What is the coefficient of proportionality that allows us to go from the first to the second line of the following table?

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The purpose of this corrected calculus exercise is to find the coefficient of a proportionality table.

Exercise example N°1333 :

By what value must we replace the ? so that the following table is a proportionality table?

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The purpose of this exercise is to find the missing value of a proportionality table.

Exercise example N°1334 :

What is the missing value in the following proportionality table?

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The purpose of this exercise is to complete using the cross product, a simple table so that it is a proportionality table.

Exercise example N°1335 :

We suppose that `3*x-2<5`. Choose the expression that is true from the list below.

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The goal of this math exercise is to solve a first degree inequation with one unknown.

Exercise example N°1336 :

Solve the following equation: 4*y-4=6.

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The purpose of this exercise is to solve a linear equation of the first degree with one unknown of the form ax+b=c.

Exercise example N°1337 :

Solve the following equation: 2*x+3=5.

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The purpose of this corrected exercise is to solve an equation with one unknown of the first degree of the form x+b=c.

Exercise example N°1338 :

Solve the following equation: 4*z+3=6*z+8.

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The purpose of this corrected exercise is to solve an equation with one unknown of the first degree of the form ax+b=cx+d.

Exercise example N°1339 :

My quadruple is equal to 32. Who am I?

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The purpose of this corrected math exercise is to solve an equation written in natural language.

Exercise example N°1340 :

In a class of 10 students 70 % got the average on the last test. What is the number of students who did not get the average?

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The purpose of this exercise is to solve a numerical problem by calculating the percentage of a whole number.

Exercise example N°1341 :

In a class of 10 students, 4 got the average in the last math test. What percentage of students got the average?

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The purpose of this math exercise is to calculate a percentage from two numbers.

Exercise example N°1342 :

In a class of 30 students there are 9 boys. What is the percentage of boys in this class?

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The purpose of this math exercise is to determine a percentage from two given integers.

Exercise example N°3300 :

In the triangle ABC rectangle in A, we give AB=20 and AC=15..
Calculate BC.

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The purpose of this exercise is to calculate the hypotenuse of a right triangle using the Pythagorean theorem.