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Hair Today, Gone Tomorrow

How long does it take to donate to Locks of Love?

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Hair Today, Gone Tomorrow

How long does it take to donate to Locks of Love?

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Hairtodaygonetomorrow lessonpage a
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How long does it take to donate to Locks of Love? Organizations like Locks of Love use donated hair to create wigs for children who need them. Donating hair is a generous act, but it also takes a long time to grow an entire wig’s worth of hair.

Students write and solve linear equations to determine how long it would take to donate a wig’s worth of hair and discuss ways they can support peers with conditions like Leukemia and alopecia.

REAL WORLD TAKEAWAYS

  • It takes ~100 inches of hair for Locks of Love to make a single wig. It would take an individual more than 16-20 years to donate a complete wig. If a classroom full of students worked together, they could donate a full wig in a fraction of the time!
  • Groups of people can often make an impact more quickly by working together.

MATH OBJECTIVES

  • Write and solve one-variable equations to solve real-world problems

Appropriate most times as students are developing conceptual understanding.
Lesson gauge medium
Grade 7
Equations & Expressions
Lesson gauge medium
Grade 7
Equations & Expressions
Content Standards 7.EE.2 Understand that rewriting an expression in different forms in a problem context can shed light on the problem and how the quantities in it are related. For example, a + 0.05a = 1.05a means that "increase by 5%" is the same as "multiply by 1.05." 7.EE.4 Use variables to represent quantities in a real-world or mathematical problem, and construct simple equations and inequalities to solve problems by reasoning about the quantities. (a) Solve word problems leading to equations of the form px + q = r and p(x + q) = r, where p, q, and r are specific rational numbers. Solve equations of these forms fluently. Compare an algebraic solution to an arithmetic solution, identifying the sequence of the operations used in each approach. For example, the perimeter of a rectangle is 54 cm. Its length is 6 cm. What is its width? (b) Solve word problems leading to inequalities of the form px + q > r or px + q < r, where p, q, and r are specific rational numbers. Graph the solution set of the inequality and interpret it in the context of the problem. For example: As a salesperson, you are paid $50 per week plus $3 per sale. This week you want your pay to be at least $100. Write an inequality for the number of sales you need to make, and describe the solutions. 7.EE.3 Solve multi-step real-life and mathematical problems posed with positive and negative rational numbers in any form (whole numbers, fractions, and decimals), using tools strategically. Apply properties of operations to calculate with numbers in any form; convert between forms as appropriate; and assess the reasonableness of answers using mental computation and estimation strategies. For example: If a woman making $25 an hour gets a 10% raise, she will make an additional 1/10 of her salary an hour, or $2.50, for a new salary of $27.50. If you want to place a towel bar 9 3/4 inches long in the center of a door that is 27 1/2 inches wide, you will need to place the bar about 9 inches from each edge; this estimate can be used as a check on the exact computation.
Mathematical Practices MP.2 Reason abstractly and quantitatively. MP.4 Model with mathematics. MP.7 Look for and make use of structure. MP.1 Make sense of problems and persevere in solving them. MP.8 Look for and express regularity in repeated reasoning.

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