Decimals Day 4
Presentation Problems
1. Mrs. Cleaver baked 1000 cookies. She donated 0.6 of them for the school’s bake
sale. Of the remainder, Mrs. Cleaver donated 0.8 for the animal shelter’s bake sale.
How many cookies did Mrs. Cleaver have left?
5 units = 1000
Mrs. Cleaver’s cookies
10 units = 400
400  10 = 40
1 unit = 40
200
200
200
200
200
1000  5 = 200
1 unit = 200
= 1000
40 40 40 40 40 40 40 40 40 40 = 400
2 units of 40
2  40 = 80
80
2 units of 200
2  200 = 400
Mrs. Cleaver has 80 cookies left.
2. Mr. Ruiz received a $500 bonus check from his employer at the end of the year. He
spent 0.25 of it on his wife. Of the remaining money, he spent 0.2 of it on his kids.
The rest he put in savings. How much of the check did he spend on his kids?
Mr. Ruiz’s Money
5 units = 375
375  5 = 75
1 unit = 75
125
? (75)
125
125
75
75
125
75
4 units = 500
500  4 = 125
1 unit = 125
= 500
75
= 375
3 units of 125
3  125 = 375
Mr. Ruiz spent $75 on his kids.
3. Of the 1200 students at Goddard High School, 0.2 of them are seniors. Of the
remaining students, 0.35 are freshmen. Of the ones remaining still, 0.5 are
sophomores. How many juniors are at GHS?
Goddard students 120 120 120 120 120 120 120 120 120 120
= 1200
48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 = 960
312
10 units = 1200
1200  10 = 120
1 unit = 120
8 units of 120
8  120 = 960
20 units = 960
960  20 = 48
1 unit = 48
13 units of 48
13  48 = 624
There are 312 juniors at GHS.
Milk it! Ask how many freshmen there are at Goddard High School.
? (312)
2 units = 624
624  2 = 312
1 unit = 312
= 624
Decimals Day 4
Assessment Problems
1. Mrs. Castillo won a $1500 gift card from Home Depot. She spent 0.3 of it on
wallpaper. Of the remaining money, she spent 0.3 on lighting. How much money did
Mrs. Castillo still have left on her gift card?
Mrs. Castillo’s $
150 150 150 150 150 150 150 150 150 150 = 1500
105 105 105 105 105 105 105 105 105 105 = 1050
? (735)
10 units = 1500
1500  10 = 150
1 unit = 150
7 units of 150
7  150 = 1050
10 units = 1050
1050  10 = 105
1 unit = 105
7 units of 105
7  105 = 735
Mrs. Castillo has $735 left on her Home Depot card.
2. When a poll was taken of 2000 people concerning their favorite season, 0.4 said
their favorite was summer. Of the remainder, 0.7 said their favorite was autumn. Of
the ones still left, 0.2 said winter. How many people claimed that spring was their
favorite season?
People
200 200 200 200 200 200 200 200 200 200 = 2000
120 120 120 120 120 120 120 120 120 120 = 1200
36
36
36
36
36
36
36
36
36
36
? (288)
10 units = 2000
2000  10 = 200
1 unit = 200
6 units of 200
6  200 = 1200
10 units = 1200
1200  10 = 120
1 unit = 120
3 units of 120
3  120 = 360
288 people claimed spring was their favorite season.
10 units = 360
360  10 = 360
1 unit = 36
8 units of 36
8  36 = 288
= 360