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Mastering Basic Decimal Operations

  • Writer: Walter Education
    Walter Education
  • Jul 11
  • 1 min read

Updated: Aug 9

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DECIMAL ADDITION

Steps:

  1. Align the decimal points vertically

  2. Add from right to left (hundredths → tenths → ones)

  3. Carry over when any column sums to 10 or more.



DECIMAL SUBTRACTION

Steps:

  1. Align the decimal points

  2. Subtract right to left (hundredths → tenths → ones)

  3. Borrow when needed (top digit < bottom digit)



DECIMAL MULTIPLICATION

Steps:

  1. Multiply normally (ignore decimals at first): 436 × 19

  2. Count total decimal places in factors: 2 (from 4.36) + 1 (from 1.9) = 3

  3. Place decimal in product to have 3 decimal places



DECIMAL DIVISION

Step-by-Step Solution:

  1. Make the divisor a whole number:

    • Multiply both numbers by 10: 128 ÷ 4

    Long division: Final answer: 32




Common Mistakes to Avoid:

✖ Forgetting to adjust both numbers

✖ Misplacing the decimal point

✖ Incorrect subtraction in long division


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Download free Decimal operation poster here.



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