Transcript RNE Lesson 21 Luke

Find quotients of + and – fractions and decimals.
Find the value of each expression.
1.
2.
3.
4.
2 8

3 9
0.14 ÷ 0.2
1 56  2 12
325 ÷ 2.5
Same Signs
+

+ = +
–

–
=
+
Different Signs
+

– =
–
–

+ =
–
9.36 ÷ (–5.2)

The numbers have different signs, so the quotient will be
negative.


Move the decimal point in the divisor.
Move the decimal in the dividend the
same number of spaces as in the divisor.
Divide.

9.36 ÷ (–5.2) = –1.8

5.2 → 52
9.36 → 93.6
 5  (4)
2
3

Same signs, so the answer will be positive.

Write as improper fractions.

Multiply by the reciprocal.

Simplify.
Scott bought a bag of cake flour that contained 38 12 cups of flour. He
makes muffins to sell at his bakery. Each batch of muffins requires 3 12
cups of flour. Determine how many batches of muffins he can make with
this bag of flour.

Write the problem.


Same signs. The answer will be positive.
Write as improper fractions.

Multiply by the reciprocal.

Scott will be able to make 11 batches.
38 12  3 12
77
7
1
38 
and 3 2 
2
2
1
2
Find each quotient.
1.
2.
3.
5  1
  
9  3
120.8 ÷ (–0.4)
2
6 
3
3
4
What clues do you look for when reading word problems
to figure out which operation (+, –, ×, ÷) you will use?