Page 210 - NUMINO TG_5A
P. 210
070_G5U13_G6U15_TG 2014.4.18 3:34 PM ˘ ` 193
13Flip It Over Unit
2 . Divide a fraction by a whole number using a reciprocal. 2. Have students use reciprocals to divide
a. 5 10 5 1 b. 4 8 4 1 fractions by whole numbers.
6 6 7 7
5 8 5
6
2a. 10
51 41 Solve the first problem for students.
56 14
60 12
Use the reciprocal of the whole number,
1 1 10. Just as a fraction is flipped to find its
3 8
c. 4 3 4 d. 2 8 2 reciprocal, the reciprocal for a whole
5 5 3 3
number is found by placing it as the
4 21 denominator over the numerator of 1.
15
24 12 10 1
10
e. 4 5 4 1 4 f. 3 7 3 1 3 Multiply the fraction by the reciprocal.
9 9 5 45 7 7 7 49
\ \
515
6 10 60
3 . Solve the word problems. Simplify the fraction.
a. Three people are sharing 6 L of cola equally. How many liters can each 51
11 60 12
person drink? 6 ı3 6 \ 1 6
11 11 3 33
2 L
11
3. Have students solve the word problems
b. Ricky wants to divide 5 kg of tomatoes evenly between four salad bowls. using reciprocals to divide fractions by whole
7 numbers.
How many kilograms of tomatoes are put in each salad bowl?
5 ı4 5 \ 1 5
7 7 4 28
5 kg
28
13. Flip It Over 119
Some students may attempt to work too fast, and therefore miss an important step in the process.
Example: 5 10
6
Students may fail to find the correct reciprocal and simply multiply.
5 10 50
6 6
This is incorrect. Remind students to always convert to a reciprocal before performing any other operation.
5A Unit 13 193
13Flip It Over Unit
2 . Divide a fraction by a whole number using a reciprocal. 2. Have students use reciprocals to divide
a. 5 10 5 1 b. 4 8 4 1 fractions by whole numbers.
6 6 7 7
5 8 5
6
2a. 10
51 41 Solve the first problem for students.
56 14
60 12
Use the reciprocal of the whole number,
1 1 10. Just as a fraction is flipped to find its
3 8
c. 4 3 4 d. 2 8 2 reciprocal, the reciprocal for a whole
5 5 3 3
number is found by placing it as the
4 21 denominator over the numerator of 1.
15
24 12 10 1
10
e. 4 5 4 1 4 f. 3 7 3 1 3 Multiply the fraction by the reciprocal.
9 9 5 45 7 7 7 49
\ \
515
6 10 60
3 . Solve the word problems. Simplify the fraction.
a. Three people are sharing 6 L of cola equally. How many liters can each 51
11 60 12
person drink? 6 ı3 6 \ 1 6
11 11 3 33
2 L
11
3. Have students solve the word problems
b. Ricky wants to divide 5 kg of tomatoes evenly between four salad bowls. using reciprocals to divide fractions by whole
7 numbers.
How many kilograms of tomatoes are put in each salad bowl?
5 ı4 5 \ 1 5
7 7 4 28
5 kg
28
13. Flip It Over 119
Some students may attempt to work too fast, and therefore miss an important step in the process.
Example: 5 10
6
Students may fail to find the correct reciprocal and simply multiply.
5 10 50
6 6
This is incorrect. Remind students to always convert to a reciprocal before performing any other operation.
5A Unit 13 193
