Securing understanding of addition and subtraction with fractions

12 questions

1. When subtracting fractions you must have ___.
2. Which of the following are not common denominators of {1}\over{4} and {7}\over{20}?
3. Which symbol is missing here? \frac{2}{9} + \frac{1}{8} \square \frac{2}{9} + \frac{1}{7}.
4. Calculate {7}\over{12} - {1}\over{3}.
5. Which of the following is not a correct alternative for {3}\over{8} - {3}\over{4} + {7}\over{16}?
6. Calculate {3}\over{8} - {3}\over{4} + {7}\over{16}.
7. What is the name of a number that has both an integer part and a fractional part?
8. Which of the following is 3 {{2} \over {3}} as an improper fraction?
9. Which of the following show a correct first step to calculate 3 {{1} \over {3}} - 1 {{5} \over {6}}?
10. Which of the following can be simplified before calculating?
11. What is the missing digit in this calculation 1 {{1} \over {3}} + 2 {{\square} \over {6}} = 4 {{1} \over {6}}?
12. Calculate 3 {{1} \over {3}} - 1 {{5} \over {6}}, give your answer in its simplest form.

License: OGL