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 = 5+2 = 7 62) 2 + 2 = 4 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 subtracting a negative number, it is equivalent to adding a positive number. For example, for the expression $a - (-b)$, it becomes $a + b$.

Step2: Perform addition

Add the numbers according to the rules of adding positive and negative numbers. If the signs are the same, add the absolute - values and keep the sign. If the signs are different, 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, $| - 7|=7$ and $|5| = 5$, $7-5 = 2$, and the sign of the larger number ($|-7|$) is negative. So $-7 + 5=-2$.

1. $4--5=4 + 5=9$
2. $1--2=1 + 2=3$
3. $-5-2=-5+( - 2)=-7$ (same sign, add the absolute values and keep the negative sign)
4. $4 - 3=1$
5. $2 - 1=1$
6. $-8-2=-8+( - 2)=-10$
7. $-8--5=-8 + 5=-3$
8. $-4--1=-4 + 1=-3$
9. $-5-4=-5+( - 4)=-9$
10. $-6--6=-6 + 6=0$

Answer:

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