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M.2 Add and subtract mixed numbers

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What are mixed numbers?

Mixed numbers are numbers that include a whole number and a fraction together. They show amounts greater than one whole.

Examples:
  • 1 12 (read as “one and one-half”)
  • 3 34 (read as “three and three-fourths”)
Note

Each mixed number can also be written as an improper fraction. For example, 1 12 = 32.

How to add mixed numbers with like denominators

When the denominators are the same, add the whole numbers and the fractions separately, then simplify if needed.

Example:
  • 2 15 + 3 25 = (2 + 3) + (15 + 25) = 5 35
Note

If the fraction part is greater than one whole, regroup it. For example, 5 65 = 6 15.

How to add mixed numbers with unlike denominators

When the denominators are different, first find a common denominator. Then, change each fraction to an equivalent fraction, add, and simplify if necessary.

Example:
  • 1 13 + 2 14
  • Find a common denominator: 12
  • Convert: 1 412 + 2 312 = 3 712
Note

Always check that the fractions have the same denominator before you add. Simplify the final answer if possible.

How to subtract mixed numbers

To subtract mixed numbers, subtract the whole numbers and the fractions separately. If the top fraction is smaller, borrow 1 from the whole number and convert it into a fraction.

Example:
  • 4 16 − 2 56
  • Borrow 1 from 4 → 3 76 − 2 56
  • Now subtract: (3 − 2) + (7656) = 1 26 = 1 13
Note

Always check your borrowing carefully. When you borrow 1 whole, it equals the denominator as a fraction (for example, 1 = 66).

Adding and subtracting a whole number with a fraction or mixed number

You can add or subtract a whole number and a fraction or mixed number by combining the whole number parts and the fractional parts separately.

Examples:
  • 5 + 34 = 5 34
  • 6 − 2 15 = 3 45
Note

If your result has an improper fraction, rewrite it as a mixed number to make it easier to read and understand.

Check your answers and simplify

After solving, always check if the fraction can be simplified or if the answer can be written as a proper mixed number.

Example:
  • 2 48 = 2 12 (simplified form)
Note

Simplifying fractions makes your final answer clear and accurate.