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Example 1-6b Objective Estimate percents by using fractions and decimals

Example 1-6b Vocabulary None

Lesson 1 Contents Example 1Use Fractions to Estimate Example 2Use Fractions to Estimate Example 3Estimate by Using 10% Example 4Percents Greater Than 100 or Less Than 1 Example 5Percents Greater Than 100 or Less Than 1 Example 6Estimate Percent to Solve a Problem

Example 1-1a Estimate 61% of 407 Write the problem 60% 6  4  240 Answer: 1/6 61% of 407 Remember: When directions say to “estimate” the exact answer will be wrong Round 61% to an easy number “of” refers to multiplication  Round 407 to an easy number 400 Multiply non-zero numbers 24 Bring down zeros 000 Remove % sign by dividing by 100 (move decimal 2 places to the left).

Example 1-1b Estimate 28% of 92. Answer:  27 1/6

Example 1-2a Estimate 18% of 296  60 20% 2  3 Answer: 2/6 Write the problem 18% of 296 Remember: When directions say to “estimate” the exact answer will be wrong Round 18% to an easy number “of” refers to multiplication Round 296 to an easy number  300 Multiply non-zero numbers 6 Bring down zeros 000 Remove % sign by dividing by 100 (move decimal 2 places to the left).

Example 1-2b Estimate 71% of 198. Answer:  140 2/6

Example 1-3a Estimate 59% of % 6  5  300 Answer: 3/6 Write the problem 59% of 500 Remember: When directions say to “estimate” the exact answer will be wrong Round 59% to an easy number “of” refers to multiplication  500 is already an easy number 500 Multiply non-zero numbers 30 Bring down zeros 000 Remove % sign by dividing by 100 (move decimal 2 places to the left).

Example 1-3b Estimate 39% of 700 Answer:  280 3/6

Example 1-4a Estimate 173% of % 17  6  102 Answer: 4/6 Write the problem 173% of 60 Remember: When directions say to “estimate” the exact answer will be wrong Round 173% to an easy number “of” refers to multiplication  60 is already an easy number 60 Multiply non-zero numbers 102 Bring down zeros 00 Remove % sign by dividing by 100 (move decimal 2 places to the left).

Example 1-4b Estimate 142% of 80. Answer:  112 4/6

Example 1-5a   9 5/6 Write the problem of 898 Remember: When directions say to “estimate” the exact answer will be wrong Keep as is “of” refers to multiplication Round 898 to number compatible with 3 the denominator 900 Multiply non-zero numbers 3 Bring down zeros 00

Example 1-5a   9 5/6 of Remove % sign by dividing by 100 (move decimal 2 places to the left). Answer:  3

Example 1-5b Answer:  2 5/6

Example 1-6a GAME ATTENDANCE Last season 96,081 people were in attendance at a college football game. About 0.25% of those were reporters from newspapers and television and radio stations. About how many media people were present? 6/6 Write the problem 0.25% of 96,081 Round 0.25% to an easy number 0.3% “of” refers to multiplication Round 96,081 to an easy number  96,000

Example 1-6a GAME ATTENDANCE Last season 96,081 people were in attendance at a college football game. About 0.25% of those were reporters from newspapers and television and radio stations. About how many media people were present? 6/6 0.25% of 96, %  96,000 Multiply non-zero numbers 3  Bring down zeros 000 Remove % sign by dividing by 100 (move decimal 2 places to the left) Remove decimal in 0.3 by moving the decimal 1 more place to left. 288 Add dimensional analysis people Answer:

Example 1-6b Answer:  35 CONCERT The attendance at a popular outdoor concert was recorded as 6,973. Of those attending, 0.5% were security personnel. About how many security people were present? * 6/6

End of Lesson 1 Assignment Lesson 8:1Percent and Estimation All