Flour and Percentage Relationships

This video tutorial covers the concepts of increasing and decreasing values in math, focusing on percent changes. It includes exercises on identifying increases and decreases, drawing diagrams to represent these changes, and expressing them as percentages of initial amounts. The tutorial also explores graphing relationships between circle diameters and circumferences and solving equations related to flour purchases. Finally, it provides guidance on finding illustrative math lessons.

In the first diagram, if y is three out of four sections of x, what is the percentage decrease of y relative to x?

• 25% increase

• 25% decrease

• 50% decrease

• 75% decrease

In the second diagram, if y is five sections and x is four sections, what is the percentage increase of y relative to x?

• 10% increase

• 30% increase

• 20% increase

• 25% increase

If a bakery used 40% more flour this month compared to last month, what percentage of last month's flour does this month's usage represent?

• 160%

• 140%

• 120%

• 100%

If the bakery used 75% less milk this month compared to last month, what percentage of last month's milk does this month's usage represent?

• 25%

• 50%

• 75%

• 100%

If there was 40% more snow this year than last year, what percentage of last year's snow does this year's snow represent?

• 100%

• 120%

• 160%

• 140%

If there were 25% fewer sunny days this year than last year, what percentage of last year's sunny days does this year's represent?

• 50%

• 75%

• 100%

• 125%

What is the relationship between the diameter and circumference of a circle?

• Diameter is pi times the circumference

• Circumference is pi times the diameter

• Circumference is twice the diameter

• Diameter is twice the circumference

If Priya bought x grams of flour and Claire bought 3/8 more than Priya, which equation represents the amount Claire bought?

• y = 11/8x

• y = x + 1/8x

• y = x + 3/8x

• y = x + 3/8

If Claire bought 3/8 more flour than Priya, and Priya bought 8/8x, what is the total amount of flour Claire bought?

• 10/8x

• 9/8x

• 11/8x

• 8/8x

How can you quickly find illustrative math lessons using a hashtag?

• Search by lesson name

• Search by teacher name

• Search by school name

• Search by hashtag with grade, unit, and lesson number