Question

assessment form b

1. tracey is reading a novel for her english class. she shaded a grid to show how much of the book she has read so far. what percent of the grid is shaded?

a 6% c 60%
b 40% d 600%

1. what is 0.85% of 20?

a 0.0017
b 0.0085
c 0.17
d 0.85

1. select all the expressions that are equivalent to 40% of 90.

□ 72
□ 36
□ $\frac{4}{5} \times 9$
□ $\frac{40}{100} \div 90$
□ $\frac{2}{5} \times 90$

1. kellys new snowboard is 120% longer than her old snowboard. if the new snowboard is 150 cm, how long is her old snowboard?
2. a survey found that 78% of high school freshmen have internet access at home. of the 754 freshmen at one high school, about how many would be expected to have internet access at home? explain.
3. mia finished 60% of her homework in 45 minutes. how many minutes will it take her to complete all of her homework at this rate? explain.

Explanation:

Problem 1

Step1: Count total grid cells

Total cells: $10 \times 10 = 100$

Step2: Count shaded grid cells

Shaded cells: $60$

Step3: Calculate shaded percentage

$\frac{60}{100} \times 100\% = 60\%$

Step1: Convert percentage to decimal

$0.85\% = \frac{0.85}{100} = 0.0085$

Step2: Multiply by 20

$0.0085 \times 20 = 0.17$

Step1: Calculate 40% of 90

$0.4 \times 90 = 36$

Step2: Check each expression

• $72$: Not equal to 36
• $36$: Equal to 36
• $\frac{4}{5} \times 9 = 7.2$: Not equal to 36
• $\frac{40}{100} \div 90 \approx 0.0044$: Not equal to 36
• $\frac{2}{5} \times 90 = 36$: Equal to 36

Answer:

C 60%

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Problem 2