Question

fill in the blanks below.
(a) a car corporation produced 620 more cars this month than last.
write a signed number to represent this month’s change in production.

(b) hong lost 100 dollars from his pocket.
write a signed number to represent this change.

Explanation:

Step1: Identify positive change

Production increased by 620, so use positive signed number: $+620$

Step2: Identify negative change

Loss of 100 dollars is a decrease, so use negative signed number: $-100$

Answer:

(a) $+620$
(b) $-100$