Find the Missing Operator in -5-5-5-5?5-15: Mathematical Expression Challenge

Question

Insert the compatible sign:

$-5-5-5-5?5-15$

00:00 Choose the appropriate sign

00:03 Find the point (-5) on the axis

00:09 Take 3 jumps left (to the negative side) on the axis

00:12 On this axis each jump equals 5

00:16 This is the solution for the left side, now let's calculate the right side

00:20 Find the point (15) on the axis

00:24 Take 1 jump left (to the negative side) on the axis

00:32 This is the solution for the right side

00:37 On the axis, as you go right the number gets larger

00:41 And this is the solution to the question

Let's recall the laws:

$-(-x)=+x$

$+(-x)=-x$

We'll solve the left side first:

$-5-5=-10$

$-10-5=-15$

$-15-5=-20$

Now let's solve the right side:

$5-15=-10$

Since the right side is larger, the appropriate sign will be:

$-20 < -10$

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