Question

change subtraction into a +/- -2 negative signs means it has changed to a positive number -add as normal -same sign = add -different sign = subtract -answer will take sign of bigger number 61) 5+-2 2 negatives make a positive 62) 2 + 2 = 5+2 = 7 63) -7--5 64) 4--5 65) 1--2 66) -6+-2 = -6+2 = -4 67) -5 - 2 68) 4 - 3 69) 2 - 1 70) -8 - 2 71) -8--5 72) -4--1 73) -5 - 4 74) -6--6

Explanation:

Step1: Change subtraction to addition

When we have two negative signs next to each other, it becomes a positive. For example, \(a--b=a + b\).

Step2: Perform addition or subtraction

If the signs of the numbers are the same, we add the absolute - values and keep the sign. If the signs are different, we subtract the smaller absolute - value from the larger absolute - value and take the sign of the number with the larger absolute - value.

1. \(-7--5=-7 + 5\)

• Since the signs are different, \(\vert-7\vert = 7\) and \(\vert5\vert = 5\), \(7-5 = 2\), and we take the sign of \(-7\). So \(-7 + 5=-2\)

1. \(4--5=4 + 5=9\)

1. \(1--2=1 + 2=3\)

1. \(-5-2=-5+( - 2)\)

• Since the signs are the same, we add the absolute - values: \(\vert-5\vert+\vert-2\vert=5 + 2 = 7\), and the sign is negative. So \(-5+( - 2)=-7\)

1. \(4-3=1\)

1. \(2-1=1\)

1. \(-8-2=-8+( - 2)=-10\)

1. \(-8--5=-8 + 5=-3\)

1. \(-4--1=-4 + 1=-3\)

1. \(-5-4=-5+( - 4)=-9\)

1. \(-6--6=-6 + 6=0\)

Answer:

1. \(-2\)
2. \(9\)
3. \(3\)
4. \(-7\)
5. \(1\)
6. \(1\)
7. \(-10\)
8. \(-3\)
9. \(-3\)
10. \(-9\)
11. \(0\)