8th grade lesson 3

Lesson 3Objective: The student will perform + and – word problems.

Notes

+ increase, total

- decrease, difference, more/less than

Example 1 In the first half of the game, Joe scored

12 points. In the whole game, he scored 27 points. How many points did Joe score in the second half?

12 + p = 27

Example 2 Jayda went to the store with a twenty

dollar bill. She bought a loaf of bread and a half-gallon of milk. The clerk gave her $15.17 in change. How much money did Jayda spend on bread and milk?

20.00 – m = 15.17 Or

15.17 + m = 20.00

Example 3 Brittney hiked to the summit of Mt. Whitney,

which began from the upper trailhead at 8365 ft. The elevation of Mt. Whitney’s summit is 14,496 ft. What was Brittney’s elevation gain from the trailhead to the summit?

14496 – 8365 = gOr

8365 + g = 14496

Example 4 Cody learned in his US History class that

President John F. Kennedy was elected in 1960 at the age of 43. In what year was he born.

1960 – 43 = aOr

1960 – a = 43

Your Turn Greyson and Cooper went to the theater

with $20.00 and left the theater with $10.50. How much money did they spend at the theater?

From 1990 to 2000 the population of Salt Lake City increased from 180,635 to 215,768. How may more people lived in Salt Lake City in 2000 than in 1990?

In the three 8th grade classrooms at Snowcrest Junior High, there are 29 students, 28 students and 31 students. What is the total number of students in the three classrooms?