CFA Strategies

When Jesse found the difference of -7-(-4), he got 3. What might Jesse have done wrong

• Jesse added the integers instead of subtracting them.

• Jesses added the inverse of each integer

• Jesse didn't make a mistake

• Jesse wrote the inverse of the correct answer, which is -3

Amy found the difference -5-4, she got 1. What might have Amy done wrong?

• Amy added the integers instead of subtracting them

• Amy added the inverse of each interger

• Amy wrote the inverse of the correct answer, which is -9

• Amy didn't make a mistake

When Dylan found the difference -7-4, he got -11. What might Dylan have done wrong?

• Dylan added the inverse of each integer

• Dylan wrote the inverse of the real answer, which is -11

• Dylan didn't make a mistake

• Dylan added the integers instead of subtracting them

When Emma found the difference -11-(-2), she got 13. What might Emma have done wrong?

• Emma added the inverse of each integer

• Emma added the integers instead of subtracting them

• Emma didn't make a mistake

• Emma wrote the inverse of the correct answer, which is -9

When Logan found the difference -3-(-2), he got -5. What might Logan have done wrong?

• Logan added the inverse of each integer

• Logan didn't make a mistake

• Logan added the integers instead of subtracting them

• Logan wrote the inverse of the correct answer, which is -1

Write and solve a word problem that can be modeled by the difference 6-8.

• At the beginning of Ruby's hike, she started 6 feet above sea level. After a few minutes, she hiked up 8 feet from where she started.

• Maddie started the game with 6 points, then improved 8 points on the next turn.

• In the afternoon the temperature was 6 degrees C. At night, the temperature rose 8 degrees.

• A football team started on the 6 yard line, then lost 8 yards on the next play.

Write and solve a word problem that can be molded by the difference 9-7.

• At the beginning of Max's hike, he started at 9 feet above sea level. He then hiked down the cliff 7 feet from where he started.

• Adam started the game with 9 points, then improved 7 points on the next turn.

• You started with $9 on Monday. Then on Tuesday you were given $7.

• In the morning the temperature was 9 degrees. In the afternoon it rose 7 degrees.

Write and solve a word problem that can be modeled by the differnce 5-12.

• Kennedy started the game with 5 points, then improved 12 points on the next turn.

• At the beginning of Valeria's hike, she started at 5 feet above sea level. After a few minutes, she hiked up 12 feet from where she started.

• A football team started on the 5 and line, then gained 12 yards on the next play.

• In the afternoon the temperature was 5 degrees. AT night, it dropped 12 degrees.

Simplify the expression -6-(-7)

Simplify the expression -8-(-4)