Question

explain how you can mentally determine 50% of a number. it is half of value

1. 6 is what percent of 10?

=0.6
. what percent is shaded? 49%

1. what percent is shaded? 9%
2. shade 40%.
3. these two visuals show how people in the united states pronounce the letter c in the word grocery. some pronounce the letter c using an “s” sound, while others use a “sh” sound.

map of how people pronounce the word \grocery\
percent of people who pronounce the word \grocery\ with a \sh\ vs. an \s\
a. what information can you determine from the map?
b. what information can you determine from the percent grid?

Explanation:

Step1: Explain 50% mental calculation

To find 50% of a number, divide it by 2 (or take half of the number).

Step2: Calculate 6 as % of 10

Use percent formula: $\text{Percent} = \frac{\text{Part}}{\text{Whole}} \times 100\%$
$\text{Percent} = \frac{6}{10} \times 100\% = 60\%$

Step3: Count shaded grid 1

Total squares = 100. Shaded squares = 40.
$\text{Shaded percent} = 40\%$

Step4: Count shaded grid 4

Full shaded squares = 9, half-shaded squares = 2 (equals 1 full). Total shaded = $9 + 1 = 10$.
$\text{Shaded percent} = \frac{10}{25} \times 100\% = 40\%$

Step5: Shade 40% of grid 5

Total squares = 20. 40% of 20 = $0.4 \times 20 = 8$. Shade 8 squares.

Step6: Analyze map (6a)

Identify regional pronunciation patterns across U.S. states.

Step7: Analyze percent grid (6b)

Calculate total U.S. pronunciation split: White squares = 60, gray squares = 40.
$\text{"sh" percent} = 60\%, \text{"s" percent} = 40\%$

Answer:

1. To mentally find 50% of a number, take half of that number (divide the number by 2).
2. 60%
3. 40%
4. 40%
5. Shade 8 out of the 20 total squares in the grid.

6a. The map shows which U.S. states use the "sh" sound, "s" sound, or have mixed pronunciation of the letter "c" in "grocery".
6b. The grid shows that 60% of people in the U.S. pronounce the letter "c" in "grocery" with an "sh" sound, while 40% use an "s" sound.