Modeling Subtraction of Fractions

TEKS 6.2A

Post-test Questions

1. What are fractions?

2. What do you do when you subtract fractions?

3. What fraction would you write for the picture below to show how many of the stripes are white?

A. ½
B. 7/13
C. 3/5
D. 6/13

4. What fraction would you write for the shaded area of the square?

A. one-half
B. one-fourth
C. three-fifths
D. three-fourths

5. Which fraction represents choice "D." above?

A. 3/4
B. ½
C. ¼
D. 3/5

6. Which choice represents this problem, "7/10 - 3/8 =" ?

M. "Three-eighths minus seven-tenths equals"
N. "Seven-tenths plus three-eighths equals"
O. "Seven-tenths minus three-eighths equals"
P. "Eight-thirds minus ten-sevenths"

7. What was done wrong in choice "D." above? The numerator and
denominators are switched, and the fractions are switched

8. The baker made a pie. He sells two pieces to the first customer and four pieces to the second customer. If the pie had fourteen pieces to start with, which problem could be used to show how much of the pie was left?

M. 4/14 + 2/14 = amount of the pie left
N. 3/7 - 1/7 = amount of the pie left
O. 4/14 - 2/14 = amount of the pie left
P. 14/14 - 6/14 = amount of the pie left

9. In Mrs. Johnson's Science class, Maria found this flower. As the day went on, 6 of the petals fell off. Which problem best represents how many petals were still on the flower?

M. 6/10 - 4/10 = amount of petals still on the flower
N. 10/10 - 4/10 = amount of petals still on the flower
O. 10/10 - 6/10 = amount of petals still on the flower
P. 4/10 + 6/10 = amount of petals still on the flower

10. How would you write answer choice "A." above in words?