Extra Review Chapter 3 Pre-Algebra

-7 1 2 + 3 1 7

Answer: -4 5 14

60 1 2 + (-37 1 6 )

Answer: 23 1 3

One gallon of water is equivalent to 8.34 pounds. Write this as a mixed number in simplest form.

Answer: 8 17 50

What is the product of -3 1 2 ∙ 5 5 6 in simplest form?

Answer:-20 5 12

What is the sum of -3 5 6 + 7 2 3 ?

Answer: 3 5 6

What is the value of 3x – 12y if x= - 2 9 and y= 4 1 6 ?

Answer:-50 2 3

Problem Solving Fifty children were surveyed and asked how much they spend on school supplies at the beginning of the year. The results are in the table below. Amount of Money $40 $45 $50 $55 $60 Number of Students 18 13 4 x y

Amount of Money $40 $45 $50 $55 $60 Number of Students 18 13 3 x y 1. If 3 4 of the children who said they spent $55 or $60 reported spending $55, then how many students said they spent $60?

Answer: 4 students (y) -Add up how many students accounted for -Multiply that numbers by ¼ as you are looking for the rest, not the ¾

Amount of Money $40 $45 $50 $55 $60 Number of Students 18 13 3 x y 2. If the number of children surveyed represents 1/8 of the entire school, how many total children might you say spent $50 on school supplies?

Answer: Think practically… if 1/8 is spending $50, take the denominator and multiply by the number of children in that column. So… 8 * 3 = 24 children

Problem-Solving Mrs. Fisher needs to make costumes for Rocky this Halloween. They are going to 6 parties and each requires a new outfit. If she needs 3 5 6 yards of fabric for each outfit; how much fabric should she buy?

Answer: 23 yds.

Last One! Mrs. Fisher has 70 yards of material. She wants to make new skirts and each skirt uses 4 2 3 yards of material. How many skirts can she make? Should this number be rounded up or down? Why?

Answer: 15 skirts, makes sense to round down since you have to have enough to make another whole skirt. Can’t have half of one!