Subtracting Integers - Need Help Solving these problems

[airbus380]

Question on his homework:

Match the subtraction expression with the equivalent addition expression.

#3. -7-7 #4. 7-(-3) #5 -7-(-3) #6. 7-3

A. -7 +3 B. 7 +(-3) C. -7 + (-3) D 7 + 3

[mmm4444bot]

The operation of subtraction is the same as "adding the opposite".

In other words, subtracting a positive number from something is the same as adding its negative.

EGs:

10 - 4 is the same as 10 + (-4)

3 - 1 is the same as 3 + (-1)

Likewise, subtracting a negative number from something is the same as adding its positive.

EGs:

10 - (-4) is the same as 10 + 4

3 - (-1) is the same as 3 + 1

Therefore, to rewrite subtraction as addition, we must change the sign of the number.

If you're still unsure how this works, please let us know.

Cheers ~ Mark