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Grade 8 Decimals Worksheets

Free printable decimals practice for Grade 8 students. Generate problems, solve them on screen or paper, and download as PDF.

Practice Worksheet

Grade 8 Decimals Practice

Solve each problem. Show your work.

  1. 1.
    Calculate: 8.55 + 4.21
  2. 2.
    Calculate: 3.96 − 2.89
  3. 3.
    Round 6.38 to the nearest tenth.
  4. 4.
    Calculate: 1.97 + 0.77
  5. 5.
    Calculate: 2.61 − 2.37
  6. 6.
    Round 8.14 to the nearest tenth.
Show answer key
  1. Question 1: 12.76
  2. Question 2: 1.07
  3. Question 3: 6.4
  4. Question 4: 2.74
  5. Question 5: 0.24
  6. Question 6: 8.1

Free Practice Worksheets

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Foundations

Build confidence with approachable problems

6 problems

Solve each problem. Take your time.

  1. 1.
    Calculate the surface area of a cylinder with radius 2.5 cm and height 4.0 cm using the formula SA = 2 * 3.14 * r * (r + h). Round your answer to the nearest hundredth.
  2. 2.
    Calculate the volume of a cylinder with radius 3.0 cm and height 5.2 cm using the formula V = 3.14 * r² * h.
  3. 3.
    Find the length of the hypotenuse 'c' in a right triangle where a = 6.4 and b = 4.8, using c = √(a² + b²).
  4. 4.
    A point at (1.5, 2.5) is translated by (3.2, -1.1). What are the new coordinates?
  5. 5.
    Convert the fraction 7/8 into a decimal, then multiply the result by 0.4.
  6. 6.
    Calculate 15% of 84.5 to determine a proportional increase in a linear relation.
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On Level — Mixed Review

Full range of grade expectations

6 problems

Solve each problem. Show your work.

  1. 1.
    Evaluate the expression: (4.25 * 10^-2) + 0.0085. Express your answer in scientific notation.
  2. 2.
    Calculate the volume of a cylinder with a radius of 2.5 cm and a height of 8.4 cm. Use 3.14 for pi and round your answer to the nearest hundredth.
  3. 3.
    A student is using the Pythagorean theorem to find the hypotenuse of a right triangle with legs measuring 5.6 cm and 3.3 cm. Calculate the length of the hypotenuse, rounding to the nearest tenth.
  4. 4.
    A clothing store is offering a 25% discount on all items. If a jacket costs 85.50 before the discount and a 7.5% sales tax is applied to the discounted price, what is the final cost of the jacket?
  5. 5.
    Order the following values from least to greatest: 1.6, 1.65, 1.605, 1.599, and 1.61.
  6. 6.
    A car travels 342.75 miles on 12.5 gallons of gasoline. How many miles per gallon does the car achieve? If the car's fuel tank holds 15.5 gallons, how far can it travel on a full tank?
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Skill map

How decimals skills connect

Shore up what feeds in, work through the core skills in order, then move on to what they unlock. A means the skill has an instant answer checker.

Build up first

Three-Digit

Grade 3

Three-Digit

Grade 3

2-Digit × 2-Digit

Grade 4

Core skills — in order

1. Adding and Subtracting

Grade 4

2. Rounding

Grade 4

3. Multiplying

Grade 5

Unlocks

Evaluating Expressions

Grade 6

Percent of a Number

Grade 6

What Your Child Will Learn

Grade 8 decimals are fully integrated into algebraic and financial problem-solving. Students divide by decimals fluently, including in multi-step expressions, and use decimals within formulas for slope, rate of change, surface area, and volume. Scientific notation introduces decimals as part of representing very large or very small numbers.

Financial literacy applications — simple interest, compound growth, unit pricing, and discounts — rely heavily on decimal multiplication and division. Students solve equations with decimal coefficients and interpret decimal answers in real-world contexts, including deciding when to round and how precision matters. Decimal fluency here supports the transition into high school math, where computation is assumed rather than taught.

Skills Covered

  • Dividing by decimals in multi-step expressions
  • Using decimals in slope and rate-of-change formulas
  • Applying decimals to scientific notation
  • Solving financial literacy problems (interest, discounts, growth)
  • Solving equations with decimal coefficients
  • Determining appropriate rounding and precision in real contexts

Curriculum Aligned: Aligned with Strand B (Number) and Strand C (Algebra): applying decimal fluency to algebraic expressions, formulas, and financial contexts.

Parent Tip: Walk through a real interest calculation together — a savings account or a loan — so your child sees why decimal precision matters when money is involved.

What your child will practice

  • Fractions, Decimals, PercentsConvert fluently between fractions, decimals, and percents.
  • Operations with Rational NumbersPerform operations with rational numbers including negative fractions and decimals.

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Frequently Asked Questions

How do decimals connect to fractions?

Decimals are fractions with denominators of 10, 100, 1000, etc. Understanding this connection helps students convert between forms and grasp place value.

What real-life examples use decimals?

Money is the most relatable example. Measurement (meters, kilograms), sports statistics, and temperature also provide practical decimal contexts.

When do students learn decimal operations?

Decimal concepts start in Grade 4 with tenths and hundredths. By Grade 6, students should be comfortable with all four operations involving decimals.

Related Worksheets

Grade 8 MultiplicationGrade 8 DivisionGrade 8 FractionsGrade 6 DecimalsGrade 7 Decimals