Question

1. 1/10 + 1/4=
2. 1/6 + 1/4=
3. 1/6 + 5/8=
4. 4/9 + 4/15=
5. 5/6 - 2/9=
6. 2/5 +1/4=
7. 3/8 + 3/10=
8. 3/4 + 1/3=
9. 2/5 - 1/4=
10. 7/9 - 3/4=
11. 7/10 - 1/4=
12. 9/10 - 5/8=
13. 1/9 + 1/7=
14. 11/12 - 3/8=
15. 5/8 -1/6=

Answer 1

Show worck plz

Answer 2

medal!

Answer 3

to do all these you need to find the LCM of the 2 denominators before you can add or subtract
LCM = Lowest Common Multiple
ie the lowest number into which each of the 2 denominators will divide into exactly

Answer 4

for example
find LCM of 4 and 6
first multiply:- 4*6 = 24

now 24 is a multiple of 4 and 6 but may not be the lowest multiple
try dividing by 2
24 / 2 = 12

- this is your LCM - both 4 and 6 will divide into it and its the lowest multiple

Answer 5

so 1/4 + 1/6

- first convert these fractions to something / 12
to do this we multiply the 1 and 4 of first frsction by 3:-
= 3/12

now multiply 1 and 6 of the 1/6 by 2:

= 2/12

so we have
2/12 + 3/12 = 5/12

we can add the 2 and 3 here because the denominator 12 is same for both fractions

Answer 6

ok next

Answer 7

so the anwser to no 2 is 5/12

follow the above process and you can do all 15

Answer 8

what do think the LCM of 4 and 10 is ( QUestion No. 1)

Answer 9

1 is completed i need 7 through 15

Answer 10

4 * 10 = 40
is it 40 or 40/2 = 20?

Answer 11

ok No 7
what is the LCM of 8 and 10?

Answer 12

8 * 10 = 80
- now divide by 2 to see if there is a lower multiple into which 8 and 10 will divide

Answer 13

80

Answer 14

6/80

Answer 15

no - divide 80 by 2

Answer 16

40

Answer 17

= 40 right
now will 8 and 10 divide into 40?

Answer 18

3/40

Answer 19

wher did you get the 3/40 from ?
all im asking is do you think 40 is the LCM of 8 and 10?

Answer 20

its the answer

Answer 21

3/10? is the answer for no 7?

Answer 22

no

Answer 23

3/40?

Answer 24

yes

Answer 25

no - no where near

Answer 26

all i need now is 13 14 15

Answer 27

even if you do not get the LOWEST common denominator, you can still use it and then reduce at the end

Answer 28

yes

Answer 29

40 is the LCM
so you need to convert 3/8 to something over/40
this way: