Math, math, math

Question

What’s 2 1/3 x 4 1/5? I’m so clueless.

Answer 1

2 1/3 = 7/3

4 1/5 = 21/5

7/3 x 21/5 = (7)(21)/(3)(5)

divide numerator and denominator by 3 to get 7(7)/5 = 49/5 = 9 4/5 = 9.8

round off 2 1/3 and 4 1/5 to 2 and 4. 2x4 = 8. You know the answer is >8. 9 4/5 looks in the right range

Or multiply 2 by 4 1/5 to get 8 2/5

then multiply 1/3 by 4 1/5 to get 1 1/3 + 1/15 = 1 5/15 + 1/15 = 1 6/15= 1 2/5

add 8 2/5 plus 1 2/5 = 9 4/5 = 9.8

2 1/3 = (2)(3) + 1)/3 = 7/3

multiply the denominator by the whole number then add the numerator, put that over the denominator

2 1/3 = 6/3 + 1/3 = 7/3

2 = 6/3

do the same with 4 1/5

5 x 4 + 1 = 21

4 1/5 = 21/5