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Glencoe Math: Course 2, Volume 1

GM

Glencoe Math: Course 2, Volume 1 View details

2. Percent and Estimation

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Exercise 2 Page 115

Start by rounding the percent. Then multiply the rounded percent by 120.

About 48

Practice makes perfect

We want to estimate 39 % of 120. Let's start by rounding the percent. rcl 39 % & ≈ & 40 % Now we multiply 40 % by 120 to get an estimation. First, we write the percent as a fraction.

40 %* 120

▼

Write the percent as a fraction

Write as a fraction

40/100 * 120

a/b=.a /20./.b /20.

40÷ 20/100÷ 20 * 120

Calculate quotient

2/5 * 120

a=a/1

2/5 * 120/1

Multiply fractions

2* 120/5* 1

Multiply

240/5

Calculate quotient

48

We found that 39 % of 120 is about 48.

Subchapter links

Guided Practice p.114

Independent Practice p.115-116

H.O.T. Problems p.116

Standardized Test Practice p.116-118

Extra Practice p.117

Common Core Review p.118