Decimals · Grades 4–8

Decimal Worksheets

Tenths, hundredths, and the careful place-value alignment that stops small slips compounding into real errors. Printable decimal worksheets with matching answer keys.

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What it is

Decimals show amounts smaller than one, using a decimal point.

Why it matters

Decimals show up anywhere money, measurement, or data does. Lining up the place values carefully is what keeps small slips from compounding into real errors.

How to do it

  1. Line up the decimal points, one under the other.
  2. Add or subtract column by column, just like whole numbers.
  3. Bring the decimal point straight down into the answer.

Examples by level

  • Beginner35.0 - 26.1 =8.9
  • Intermediate32.398 - 30.547 =1.851
  • Advanced108.548 - 78.286 =30.262

Examples are generated by the same engine as the worksheets, so they're always mathematically correct. Built to avoid repeats, not reshuffle the same handful of questions.

Common mistakes

  • Not lining up decimal points when adding or subtracting.
  • Ignoring trailing place values.
  • Misplacing the decimal point in the answer.

Tips

  • Keep the decimal points in a straight line.
  • Fill empty places with 0 so columns match.

For parents

Money is the friendliest way in, practice with prices and change to make decimals feel useful.

For teachers

Insist on aligned decimal points and use grid paper if needed; most decimal errors are alignment errors.

Key vocabulary

decimal point
separates whole numbers from parts
tenths
the first place after the point

Frequently asked questions

How are decimals and fractions related?
Every decimal is a fraction with a denominator that is a power of ten, 0.25 is 25 hundredths, or 1/4.
What grade are decimals taught?
Decimals are introduced in Grade 4 with adding and subtracting tenths, then hundredths in Grade 5 and thousandths in Grade 6.

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