Question

WILL GIVE MEDAL!!!!!!!!!!! Directions: Drag the tiles to the correct boxes to complete the pairs. Let A = 2, B =2/5 , and C =3/8 . Find the value of each expression below.
2 1/40 1 3/20 1 39/40 1 7/40
2 - 2/5 + 3/8 <--------->
2 + 2/5 - 3/8 <------->
2 x 2/5 + 3/8 <-------->
2 x 3/8 + 2/5 <-------->

Answer 1

@CountryGurl15

Answer 2

@GreenCat

Answer 3

@cupcakerain

Answer 4

@Michele_Laino

Answer 5

@michele_laino

Answer 6

I know it is in Biology. I accidentally did that. :)

Answer 7

we have :
2 1/40 = 81/40

Answer 8

Ok

Answer 9

now we have to search for the right computation which give us 81/40

Answer 10

Ok

Answer 11

for example, I will compute the first expression:

Answer 12

Ok

Answer 13

oops.. I have made an error

Answer 14

Ok it is fine

Answer 15

\[2 - \frac{2}{5} + \frac{3}{8} = \frac{{2 \times 40 - 2 \times 8 + 3 \times 5}}{{40}} = \frac{{80 - 16 + 15}}{{40}} = ...?\]

Answer 16

Ok it may take a minute so...

Answer 17

\[\frac{ 79 }{ 40 }\]

Answer 18

ok! So the first computation doesn't match with 81/40

Answer 19

Right

Answer 20

then I try to compute the second expression, as follows:

Answer 21

Ok

Answer 22

\[2 + \frac{2}{5} - \frac{3}{8} = \frac{{2 \times 40 + 2 \times 8 - 3 \times 5}}{{40}} = \frac{{80 + 16 - 15}}{{40}} = ...?\]

Answer 23

\[\frac{ 81 }{ 40 }\]

Answer 24

ok! we have found our first match

Answer 25

YAY!!!!

Answer 26

So A - B + C is 2 1/40?

Answer 27

no, A+B-C = 2 1/40

Answer 28

Oh ok so lets work on the next one

Answer 29

now we have:
\[1{\text{ }}3/20{\text{ }} = 1 + \frac{3}{{20}} = \frac{{23}}{{20}}\]

Answer 30

Is the first one 1 39/40 for A - B + C

Answer 31

yes!

Answer 32

YAY!!! Ok so the last two

Answer 33

ok!

Answer 34

I will compute the third expression as follows:
\[2 \times \frac{2}{5} + \frac{3}{8} = \frac{4}{5} + \frac{3}{8} = \frac{{4 \times 8 + 3 \times 5}}{{40}} = \frac{{32 + 15}}{{40}} = ...?\]

Answer 35

\[\frac{ 47 }{ 40 }\]

Answer 36

ok! Nevertheless it is not what we are searching for

Answer 37

Right so it would be the answer to which one?

Answer 38

I try to compute the fourth expression:

Answer 39

Ok

Answer 40

\[2 \times \frac{3}{8} + \frac{2}{5} = \frac{6}{8} + \frac{2}{5} = \frac{{6 \times 5 + 2 \times 8}}{{40}} = \frac{{30 + 16}}{{40}} = ...?\]

Answer 41

\[\frac{ 46 }{ 40}\]

Answer 42

ok! We have found our third match, since we can write: