Tips and tricks for speedy mental division with harder fractions I'm looking for a strategy to solv

Andy Erickson

Andy Erickson

Answered question

2022-05-29

Tips and tricks for speedy mental division with harder fractions
I'm looking for a strategy to solve these kind of questions rapidly. Do you guys have any suggestions?
15 25 X = 14 35 .
A. 3 5
B. 63 30
C. 14 15
D. 9 6
The only thing I can think of, is to look at
14 35 .
and notice that the denominator has increased compared to the numerator, hence I can rule out A and C. Leaving only 2 options.

Answer & Explanation

aqueritztv

aqueritztv

Beginner2022-05-30Added 10 answers

Strategy? well, I swing the x in the denominator over and flip the coefficient back.
15 25 X = 14 35 .
15 25 = 14 35 X
15 25 35 14 = X
15 5 7 14 = X
3 1 1 2 = X
3 2 = X
Emery Boone

Emery Boone

Beginner2022-05-31Added 3 answers

Write it as X = 35 14 15 25 and cancel obvious factors. Do you recognize the factor 7 in the first one?

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