What is 1/21+13/8?

How much is 121 plus 138. Step by step solution expressed as a proper or improper fraction, mixed number and decimal form.

  • 281168
  • 1 113168
  • 1.6726 (rounded to 4 decimals)

Step by step solution

Add

121 + 138 = 281168

  1. Find common denominator by finding the Least Common Multiple(LCM)

    Multiples of 21 are   21, 42, 63, 84, 105, 126, 147, 168 ....etc

    Multiples of 8 are   8, 16, 24, 32, 40, 48, 56, 64, ..., 168 ...etc

    The LCM of 21 and 8 is 168. So, the common denominator of 121 and 138 is 168. Now change the fractions into equivalent fractions with common denominator

    • 121 + 138
    • 1 * 821 * 8 + 13 * 218 * 21
    • 8168 + 273168
  2. Add

    • 8168 + 273168
    • 8 + 273168
    • 281168

    Add the numerators and place the sum over the common denominator.

Simplify

  • 281168
  • 1 113168
  1. Reduce fraction to its lowest terms

    The greatest common divisor of 281 and 168 is 1, the fraction 281168 cannot be further simplified or reduced to lowest terms

  2. Convert improper fraction 281168 to mixed number

    • 281168
    • 1 113168

    281 divided by 168 is 1 with a remainder of 113