Lesson 2-1
Lesson 2-1
Activity 1
Lesson 2-2
Lesson 2-2
100
Write the sum shown by the arrows.
.
−5 + 11 = 6
100
56 + (−48) + (−30)
−22
100
0.34 + 495.5 + 99.008
594.848
100
Find the difference
5 − 7
5 + (−7) = −2
100
132 − 178 + 59
13
200
Write the sum of the arrows
−2 + (−5) = −7
200
−45 + (−45) + (−45)
−135
200
14.127 ÷ 5.1
2.77
200
4 − (−3)
4 + 3 = 7
200
Gina was touring New Orleans, which has an elevation of 5 feet below sea level, or −5 ft. A helicopter flew over her at an elevation of 186 ft. How far above the ground where Gina was standing was the helicopter?
|−5 − 186| = 191; 191 ft
300
draw a number line from −8 to 8. Illustrate the move along the number line to find each sum.
5 + (−7)
−2
300
−154 + (−89) + 226
−14
300
1/10 x 3/11
3/110
300
−6 − 1
−6 + (−1) = −7
300
What number must you subtract from −13 to get a difference of 0? Explain.
−13. Explanations may vary: I would add 13 to −13 to get 0; subtracting a −13is the same as adding 13, so I would subtract −13.
400
−5 + 3
−2
400
At 8:00 AM, the temperature was −6°F. By noon, the temperature had risen by 9°F. What was the temperature at noon?
Expressions may vary. −6 + 9; the temperature at noon was 3°F.
400
21 divided by 3 and 1/2
6
400
−2 − (−5)
−2 + 5 = 3
400
Find the distance between the two points.
5
500
−2 + (−5)
−7
500
Jamal reached into a bag and pulled out a handful of counters. He pulled out 16 negative counters and 27 positive counters. What was the combined value of the counters?
Expressions may vary. −16 + 27; the combined value was 11.
500
Write the fraction as a decimal. Then identify the decimal as terminating or repeating.
10/11
0.90; repeating
500
At 8:00 PM, the temperature was 16°F. By midnight, the temperature had fallen by 19°F. What was the temperature at midnight?
16 − 19 = −3; −3°F
500
−6.75 + 8 − 2.2
−0.95