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Why cant I mentally do math?

I dont how to add or subtract mentally and its frustrating to do it on paper. I am in the 9th grade and I am trying to add and subtract mentally but I just can't. How can I mentally do it?

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That is because the new modernized methods of teaching don't include teaching you math in your head .. It is primarily done by calculator. Doing math without a calculator takes practice, and memory work. Mathematical skills are like a muscle .. they have to be exercised regularily, or you lose them.

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simply practice this'll help lots :)

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Use a calculator or study

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I have the same problem but in 8th I just use my fingers lol:)

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you learn tricks. just as you learned tricks for multiplying there are tricks to adding and subtracting. practice and soon you'll see math is just patterns.

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I'm in 9th grade (but going into 10 after summer vacation) and I can't do it either! You're not alone! :)

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Take small steps to eventually do math in your head. Start out with adding small numbers, such as 12+8=____? and do exercises everyday. When you feel confident adding these, move onto bigger numbers.

You could also explain your math troubles to a teacher after school. That's what they are there for! Good luck :)

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Counting backwards is the method that I use for subtraction. If 30 people want to buy lunch and 3 have a bag lunch. Is it easier to subtract three from 33? Or is it easier to count to 30?
Make a picture of what you are trying to add. Make a graph. Do all your homework at your own pace, every night. Get into an easier math class. Take the Nicest teacher at the school, not the most popular.

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Just practice your math a lot, like work on flashcards.

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