Rational numbers   »      

When you started the website, a
problem with rational numbers
was generated.

Your task is to
specify the missing number instead of x.

If you are clever, you can use the distributive law.

Click on  check  to check your answer.

Click on  new  to create a new problem.

Can you top 355 points?

Topic: Calculate in ℚ
Apply arithmetic laws

What number is x?
       

Enable keyboard
  • Distributive Law -1-
    Each value in the brackets is multiplied by the factor in front of the brackets.

    3 × 17 + 3 × 13 = 3 × ((17 + 13))
    51 + 39 = 3 × 30
    90 = 90

    General:
    a × b + a × c = a × ((b + c))
       a,b,c ∈ ℕ0
  • Distributive Law -2-
    Each value in the brackets is multiplied by the factor in front of the brackets.

    8 × 27 - 8 × 17 = 8 × ((27 - 17))
    216 - 136 = 8 × 10
    80 = 80

    General:
    a × b - a × c = a × ((b - c))
       a,b,c ∈ ℕ0