# Khan/khan-exercises

Older
100644 81 lines (80 sloc) 4.37 KB
 4fce3f6 multiplication_1 finished, percentage_word_problems_1 frameworked, st… swestwood authored May 20, 2011 1 323150a Believe percentage_word_problems is completely ported. swestwood authored May 31, 2011 2 4fce3f6 multiplication_1 finished, percentage_word_problems_1 frameworked, st… swestwood authored May 20, 2011 3 72418b8 Add meta charset to all HTML pages. jeresig authored Jul 28, 2011 4 07d95d3 spicyj authored Jul 22, 2011 5 Percentage word problems 1 075f731 Space/tab cleanup spicyj authored Jun 2, 2011 6 4fce3f6 multiplication_1 finished, percentage_word_problems_1 frameworked, st… swestwood authored May 20, 2011 7 8 075f731 Space/tab cleanup spicyj authored Jun 2, 2011 9
10
11
12
b59256d Remove extra KhanUtils, not necessary in var blocks marcia authored Jun 2, 2011 13 randRange( 1, 150 ) 14 randRange( 2, 100 ) 075f731 Space/tab cleanup spicyj authored Jun 2, 2011 15
16

a16f0e4 Tiny wording tweaks spicyj authored Aug 31, 2011 17 What is A_SIMPLE% of B_SIMPLE? (Round to nearest whole number.) 075f731 Space/tab cleanup spicyj authored Jun 2, 2011 18

6f2c5fb Use new answer forms marcia authored Aug 2, 2011 19

round((A_SIMPLE * B_SIMPLE) / 100)

075f731 Space/tab cleanup spicyj authored Jun 2, 2011 20
21

d6eaf10 Introduce dollar answer form that accepts $10.75 and 10.75 marcia authored Sep 23, 2011 22 A_SIMPLE / 100 \times B_SIMPLE \approx round((A_SIMPLE * B_SIMPLE) / 100) 075f731 Space/tab cleanup spicyj authored Jun 2, 2011 23 24 25 26 27 a16f0e4 Tiny wording tweaks spicyj authored Aug 31, 2011 28 B_SIMPLE is A_SIMPLE% of what number? (Round to the hundredths place.) 075f731 Space/tab cleanup spicyj authored Jun 2, 2011 29 6f2c5fb Use new answer forms marcia authored Aug 2, 2011 30 round(((B_SIMPLE * 100) / A_SIMPLE) * 100) / 100 075f731 Space/tab cleanup spicyj authored Jun 2, 2011 31 32 Let x be the number that B_SIMPLE is A_SIMPLE% of. d6eaf10 Introduce dollar answer form that accepts$10.75 and 10.75 marcia authored Sep 23, 2011 33

A_SIMPLE / 100 \times x = B_SIMPLE

075f731 Space/tab cleanup spicyj authored Jun 2, 2011 34

x=B_SIMPLE/A_SIMPLE / 100

35

x \approxround((B_SIMPLE * 100/A_SIMPLE * 100))/100

36
37
38
39
b59256d Remove extra KhanUtils, not necessary in var blocks marcia authored Jun 2, 2011 40 randRange( 2, 100 ) 41 BANK_FEWER + randRange(5, 2 * BANK_FEWER + 10 ) 075f731 Space/tab cleanup spicyj authored Jun 2, 2011 42
43

a16f0e4 Tiny wording tweaks spicyj authored Aug 31, 2011 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.)

6f2c5fb Use new answer forms marcia authored Aug 2, 2011 45

round(((BANK_MORE - BANK_FEWER) * 10000) / BANK_FEWER) / 100

075f731 Space/tab cleanup spicyj authored Jun 2, 2011 46
47

The bank account grew by BANK_MORE - BANK_FEWER = BANK_MORE - BANK_FEWER dollars

f1c3306 spicyj authored Jul 26, 2011 48

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

075f731 Space/tab cleanup spicyj authored Jun 2, 2011 49
50
51
52

a16f0e4 Tiny wording tweaks spicyj authored Aug 31, 2011 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.)

6f2c5fb Use new answer forms marcia authored Aug 2, 2011 54

round(((BANK_MORE - BANK_FEWER) * 10000) / BANK_MORE) / 100

075f731 Space/tab cleanup spicyj authored Jun 2, 2011 55
56

The bank account decreased by BANK_MORE - BANK_FEWER = BANK_MORE - BANK_FEWER dollars

f1c3306 spicyj authored Jul 27, 2011 57

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

075f731 Space/tab cleanup spicyj authored Jun 2, 2011 58
59
60
61
b59256d Remove extra KhanUtils, not necessary in var blocks marcia authored Jun 2, 2011 62 randRange( 10, 150 ) 63 randRange( 50, 999 ) 075f731 Space/tab cleanup spicyj authored Jun 2, 2011 64 round(YEAR_THIS * 10000 / (100 + YEAR_PERCENT_MORE)) / 100 65
66

a16f0e4 Tiny wording tweaks spicyj authored Aug 31, 2011 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.)

d6eaf10 Introduce dollar answer form that accepts \$10.75 and 10.75 marcia authored Sep 23, 2011 68

YEAR_LAST

075f731 Space/tab cleanup spicyj authored Jun 2, 2011 69
d9c2e7e Fix pronouns on percentage word problems spicyj authored Jul 20, 2011 70

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

075f731 Space/tab cleanup spicyj authored Jun 2, 2011 71

x + YEAR_PERCENT_MORE / 100x = YEAR_THIS

72

(100 + YEAR_PERCENT_MORE) / 100x = YEAR_THIS

73

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

74

x \approx YEAR_LAST

75
76
77
78
4fce3f6 multiplication_1 finished, percentage_word_problems_1 frameworked, st… swestwood authored May 20, 2011 79 cf02179 Strip trailing whitespace spicyj authored Jun 1, 2011 80
Something went wrong with that request. Please try again.