Question

____ - (-17) = 31

Answer 1

change the - - to + (two minus signs become +)
so now it is

___+17 = 31

some number plus 17 is 31
we could guess: 10+17= 27 no too small
20+17= 37 no too big

or we could figure it as 31-17

Answer 2

okay

Answer 3

wait so its 31

Answer 4

you want a number that is smaller than 31. You add 17 to the number to get 31

Answer 5

13

Answer 6

i mean 14

Answer 7

13+17= 30

Answer 8

yes, 14

notice that 31-17= 14 (that is the quick way to find the number)

Answer 9

so what about this one

Answer 10

if we add 17 to both sides:
31 -17 +17 = 14+17
and we know -17+17 is zero
31= 14+17

Answer 11

--- / -7 = -7

Answer 12

First, you know a - divided by a - will be + . (minus/minus --> plus) so the top number is not -, it is positive.

Answer 13

okay.

Answer 14

like in the 20's ?

Answer 15

let's try 21:

21/ -7 = -3

Answer 16

7 goes into 21 exactly 3 times.

Answer 17

ok so what would be the best answer

Answer 18

--- / -7 = -7

to answer, notice this:
21/ -7 = -3
but notice that -7*-3= 21 (that is not a coincidence)
28/ -7 = -4 and -4* -7= 28

so ___/ -7 = -7 what about __ = -7*-7 as the answer?

Answer 19

-7 * -7?

Answer 20

can you do -7*-7 ?

Answer 21

two minus signs (when multiplying or dividing) become a plus sign
so -7*-7 becomes 7*7
7*7= ?

Answer 22

49

Answer 23

and 49/-7 = ?

we have + divided by - so the answer is -
now do 49/7 = ? and add in the minus sign
-7 is the answer.

so 49/ -7 = -7

Answer 24

so 49 is the answer

Answer 25

yes

Answer 26

Thanks.

Answer 27

I take it this still isn't very clear. But practice helps.

Answer 28

i got it thanks :)