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Posted by311 year ago
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## Last 10 Questions of Math

What are some important formulas/calculator tricks/information do I need to know for the last 10 questions of the math portion of the ACT? I usually get barely any wrong on the first 50, then I have no clue how to do like 6 of the last 10 questions

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level 1
346 points · 1 year ago

http://www.mcelroytutoring.com/blog-post.php?id=4329&title=The+Top+10+ACT+Math+Formulas+You%27ve+Never+Heard+Of+%28and+51+more%29

You're welcome ;) . Also, I received a 36 on the math portion of the December 2016 exam, so let me know if you have any questions!

level 2
31Original Poster2 points · 1 year ago

Can you give a quick summary on how to do matrixes? as well as permutations, I don't really know how either works it's been a while since ive done either

level 3
[deleted]
3 points · 1 year ago

Your calculator can do matrices for you btw.

level 3
342 points · 1 year ago

Matrices have dimensions (a x b) where a is the number of rows (horizontal) and b is the number of columns (vertical). To add/subtract two matrices, their dimensions must be EXACTLY the same. To multiply two matrices (a x b) and (c x d), b=c; watch (https://www.khanacademy.org/math/precalculus/precalc-matrices/multiplying-matrices-by-matrices/v/multiplying-a-matrix-by-a-matrix) to learn how to further multiply them. For permutations, order matters, but for combinations, it does not (https://www.mathsisfun.com/combinatorics/combinations-permutations.html). Example: How many possible ways can 7 olympians win a bronze, silver, and gold medal? The order in which they win the medals (bronze, silver, or gold) does matter, so it's a permutation. 7P3= 7654321/432*1=210 ways 7 olympians can win a bronze, silver, and gold medal. Hope this helps.

level 4
31Original Poster1 point · 1 year ago

yep, Thanks!

level 4
341 point · 1 year ago

Sorry, the formatting on the bottom calculation is a bit off. All the numbers are meant to be single digits multiplied by each other.

level 1
1 point · 1 year ago

This would be helpful for me as well. It would be nice to know what formulas on math I may need to know. Thanks!

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