Which answer choice shows the correct way to use compensation to find the difference:

Question

1
,
518

−

1
,
294
?

A.
subtract 1,300, add 6

B.
subtract 1,300, subtract 6

C.
subtract 1,200, add 6

D.
subtract 1,200, subtract 6

Answer 1

Add or subtract.
(m2 – m – 3) + (m – 4)

A. m2 + m – 1
B. m2 + 2m – 7
C. m2 – 7
D. m2 – 1

Answer 2

Simplify the expression by combining like terms:

(m2 – m – 3) + (m – 4) = m2 – m – 3 + m – 4

= m2 + (-m + m) + (-3 – 4)

= m2 – 7

Answer: C. m2 – 7