adding and subtracting mixed numbers

Front

What must you do first in order to add or subtract fractions with unlike denominators?

Back

Find a common denominator.

Front

The number on top of the fraction bar is called the _______. The number under the fraction bar is called the ______.

Back

numerator; denominator

Front

Common denominator for fractions 2/3 and 3/4? Options: 3, 4, 7, 12

Back

12

Front

Common denominator for 1/5 and 5/6? Options: 30, 11, 6, 5

Back

30

Front

Common denominator for fractions 3/10 and 1/5?

Back

10

Front

Common denominator for 1/2, 1/3, and 1/4?

Back

12

Front

Which of these numbers could NOT be a common denominator for these two fractions?
1/3   and   3/6
Options: 3, 6, 12, 18

Back

3

Front

Which of these numbers could NOT be a common denominator for these two fractions?
2/4   and   3/8
Options: 32, 12, 8, 24

Back

12

Front

Which of these numbers could NOT be a common denominator for these two fractions?
1/6   and   1/4
Options: 12, 18, 24, 36

Back

18

Front

Which of these numbers could NOT be a common denominator for these three fractions? 1/3, 2/5, 3/10. Options: 15, 30, 60, 90

Back

15