# Khan/khan-exercises

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 4fce3f6 multiplication_1 finished, percentage_word_problems_1 frameworked, st… swestwood authored May 20, 2011 1 d529248 spinning meals and locations smenks13 authored Oct 20, 2011 2 4fce3f6 multiplication_1 finished, percentage_word_problems_1 frameworked, st… swestwood authored May 20, 2011 3 4e4cb9b lint: tabs->spaces and jQuery->$for exercises beneater authored Apr 10, 2012 4 5 Percentage word problems 1 6 4fce3f6 multiplication_1 finished, percentage_word_problems_1 frameworked, st… swestwood authored May 20, 2011 7 8 4e4cb9b lint: tabs->spaces and jQuery->$ for exercises beneater authored Apr 10, 2012 9
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13 randRange( 1, 150 ) 14 randRange( 2, 100 ) 15
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17 What is A_SIMPLE% of B_SIMPLE? (Round to nearest whole number.) 18

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round((A_SIMPLE * B_SIMPLE) / 100)

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22 A_SIMPLE / 100 \times B_SIMPLE \approx round((A_SIMPLE * B_SIMPLE) / 100) 23

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28 B_SIMPLE is A_SIMPLE% of what number? (Round to the hundredths place.) 29

bd7192e Clean up minor nits. cbhl authored Jan 17, 2013 30

round(((B_SIMPLE * 100) / A_SIMPLE) * 100) / 100

4e4cb9b lint: tabs->spaces and jQuery->$for exercises beneater authored Apr 10, 2012 31 32 Let x be the number that B_SIMPLE is A_SIMPLE% of. 33 A_SIMPLE / 100 \times x = B_SIMPLE 34 x=B_SIMPLE/A_SIMPLE / 100 35 x \approxround((B_SIMPLE * 100/A_SIMPLE * 100))/100 36 37 38 39 40 randRange( 2, 100 ) 41 BANK_FEWER + randRange(5, 2 * BANK_FEWER + 10 ) 42 43 44 person(1) has BANK_MORE dollars in the bank today. Yesterday, he(1) had BANK_FEWER dollars in the bank. By what percentage did person(1)'s bank account increase over the past day? (Round your answer to the nearest hundredth of a percent.) 83ab06d Change "percent" answer type to interpret answer key as a decimal; ac… beneater authored Jan 21, 2013 45 roundTo(4, (BANK_MORE - BANK_FEWER) / BANK_FEWER) 4e4cb9b lint: tabs->spaces and jQuery->$ for exercises beneater authored Apr 10, 2012 46
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The bank account grew by BANK_MORE - BANK_FEWER = BANK_MORE - BANK_FEWER dollars

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\frac{BANK_MORE - BANK_FEWER}{BANK_FEWER} \approx round(((BANK_MORE - BANK_FEWER) * 10000) / BANK_FEWER) / 100\%

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53 person(1) has BANK_FEWER dollars in the bank today. Yesterday, he(1) had BANK_MORE dollars in the bank. By what percentage did person(1)'s bank account decrease over the past day? (Round your answer to the nearest hundredth of a percent.)

83ab06d Change "percent" answer type to interpret answer key as a decimal; ac… beneater authored Jan 21, 2013 54

roundTo(4, (BANK_MORE - BANK_FEWER) / BANK_MORE)

4e4cb9b lint: tabs->spaces and jQuery->\$ for exercises beneater authored Apr 10, 2012 55
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The bank account decreased by BANK_MORE - BANK_FEWER = BANK_MORE - BANK_FEWER dollars

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\frac{BANK_MORE - BANK_FEWER}{BANK_MORE} \approx round(((BANK_MORE - BANK_FEWER) * 10000) / BANK_MORE) / 100\%

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62 randRange( 10, 150 ) 63 randRange( 50, 999 ) 64 round(YEAR_THIS * 10000 / (100 + YEAR_PERCENT_MORE)) / 100 65
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67 person(1) has YEAR_PERCENT_MORE% more money today than he(1) did this time last year. If person(1) has YEAR_THIS dollars today, how many dollars did he(1) have this time last year? (Round to the nearest penny, which is 1/100 of a dollar.)

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YEAR_LAST

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Let x be the amount of money that he(1) had last year.

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x + YEAR_PERCENT_MORE / 100x = YEAR_THIS

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(100 + YEAR_PERCENT_MORE) / 100x = YEAR_THIS

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x = \frac{YEAR_THIS}{(100 + YEAR_PERCENT_MORE) / 100}

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x \approx YEAR_LAST

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79 4fce3f6 multiplication_1 finished, percentage_word_problems_1 frameworked, st… swestwood authored May 20, 2011 80 cf02179 Strip trailing whitespace spicyj authored Jun 1, 2011 81
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