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05032012  #1 
Join Date: Dec 2011
Posts: 6

need help
seal123 & sky123 need help with a quiz we have to take on fraction & i need help with mutiply, divived, add,& subturacting fraction. like if only have one number + a fraction what do we do. but we need to figure them out frist or something. also how do we mutiply a huge number like 100003333*963452=
how do times that. what it = a bigger number or a smaller number. but dose it get harder in a high school. pleasssssssssssssssssssssssssssssse help me sos. thank you though so many question to ask about math 
05042012  #2  
Join Date: Dec 2011
Posts: 90

Quote:
Adding fractions with different denominators can be done by making a common number for the denominators. For example: 4/9 + 2/3 = ? We can't just add them together, because they have different denominators (bottom numbers). So, what we can do, is multiply one of the fractions, both at the top and bottom. 4/9 + (2*3)/(2*3) 'Here, you're multiplying the second fraction's top and bottom numbers. 4/9 + 6/9 = ? Then, it makes it easier, as you can do it simply. 4/9 + 6/9 = 10/9 = 1 1/9. Minusing fractions is similar: 2/5  6/20 = (2*4)/(5*4)  6/20 = 12/20  6/20 = 6/20 = 3/10 (simplified)  Multiplying fractions is a lot different. Be careful in mixing them up! To multiply fractions, you simply multiply the top, and multiply the bottom, and you're done. 7/9 * 4/7 = (7*4)/(9*7) =28/63 Dividing is different from all other types. Instead, you inverse (rotate around) the second number. You must rotate the second number for it to work. 4/9 rotated around would be 9/4. Then, once rotated, you can multiply. 10/12 divided by 5/2 = 10/12 * 2/5 = 20/60 = 3 Quote:
However, right now, you would do it like normal multiplication. It's painful, I know 10003333 963452 * 20006666 + 500166650 + ..... and so on. 

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