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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 26 Page 117

Round each number and multiply.

About 27

Practice makes perfect

We want to estimate 32 % of 89.9. Let's start by rounding each number. rcl 32 % & ≈ & 30 % [0.3em] 89.9 & ≈ & 90 Now we multiply 30 % by 90 to get an estimation. First, we write the percent as a fraction.

30 %* 90

▼

Write the percent as a fraction

Write as a fraction

30/100 * 90

a/b=.a /10./.b /10.

30÷ 10/100÷ 10 * 90

Calculate quotient

3/10 * 90

a=a/1

3/10 * 90/1

Multiply fractions

3* 90/10* 1

Multiply

270/10

Calculate quotient

27

We found that 32 % of 89.9 is about 27.

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