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29 Cards in this Set
- Front
- Back
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How to Add/subtract fractions? |
If same denominator, can just add or subtract numberator. If not, you need to first find a common demoniator. |
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Two ways you can perform this equations. 2/3+ 3/4= |
common denomiator= 12. 3 * 4= 12 so multiply 2 by 4= 8; 4*3= 12 so multiply 3*3=9; 8/12 + 9/12= 17/12 OR multiply denominator of one with numerator of another after multiplying denomiinators to find common denominator. 2*4= 8 3*3= 9 8/12+ 9/12= 17/12. Faster |
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How to multiply fractions? |
Just multiply across...numberator with numerator denominator with denominator. |
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How to divide fractions? |
Find recipricol of 2nd fraction and then multipily with first fraction |
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Ex. 7/ (one-half) |
recipricol of 1/2 is 2. Multiply 7 * 2= 14 |
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How to compare fractions? 3 ways. ex. 6/19 vs 2/13 |
calculator. find common denominator OR use bowtie method 19*2= 38 6*13= 78 6/19 is greater than 2/13 |
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How to compare decimals? |
Line it up, fill in missing zeros. have a look see. |
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What are the different digits places called? 0.145 |
0 is in the units 1 is tenth 4 is hundreth 5 is thousandeth |
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Fractions are a fancy way of |
dividing |
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To convert fraction to percent? |
get denominator to be 100 |
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Convert decimal to percentage? |
move decimal two places to right. |
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Percentage-decimal fraction equivalence .01 |
1/100; 1% |
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Percentage-decimal fraction equivalence .2 |
1/5; 20% |
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Percentage-decimal fraction equivalence .3333.. |
1/3; 33 1/3 % |
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Percentage-decimal fraction equivalence .1 |
1/10; 10% |
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Percentage-decimal fraction equivalence .25 |
1/4; 25% |
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Percentage-decimal fraction equivalence .4 |
2/5; 40% |
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Percentage-decimal fraction equivalence .5 |
1/2; 50% |
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Percentage-decimal fraction equivalence .6 |
3/5; 60% |
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Percentage-decimal fraction equivalence .666... |
2/3; 66 2/3 % |
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Percentage-decimal fraction equivalence .75 |
3/4; 75% |
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Percentage-decimal fraction equivalence .8 |
4/5; 80% |
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Percentage-decimal fraction equivalence 1.0 |
1/1; 100% |
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Percentage-decimal fraction equivalence 2.0 |
2/1; 200% |
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Percentage increase/decrease equation |
Percent change= (larger #- smaller #) / original * 100 |
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Word and symbol equivalent percent is of, times, product what |
percent- /100 is- = of, times, product= * what- any variable |
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What is difference between ratio and fraction/percentage? |
ratio is relationsihp from part to part fraction and percentage is relationsihp to the whole But can manipulate similarly |
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For ratio problems, use what method? |
ratio box; ratio multiply by real see p 237 |
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What is a proportion? |
equivalent relationship between 2 ratios or 2 fractions ex. 1/2 is proportional to 2/4 |
