Chocolate-raspberry heart-shaped cake - Students build a heart cake and use ratio information to find the quantities of cake and icing resulting from increased dimensions.
A parametric heart ... with love - Students use unit triangles and manually calculate sine and cosine of π/2, π, 3π/2, and 2π as they try to graph this great-looking, curvy heart using parametric equations. We also have them create it using Excel, on a graphing calculator and with online graphing tools.
Which Sweet Heart candies are the best deal? - Students decide which quantity of Sweet Heart candies is the best deal. Ratio tables, unit ratios, devising convincing arguments.
Sweetheart Candies - unit rate and ratio activity using those little candy hearts.
Where have all the flowers ... come from? - Analyze a pictograph to see what can be deduced. Cost of flowers in different countries, source of flowers, how many hours you must work to earn a rose ...
Valentine Cardioid - Four ways to construct cardiodes for Valentine's Day.
How did I graph this heart? - What equations helped me draw this Valentine's heart? 8.EE, 8.F, HSA, HSG
Holiday Candy Sales - Translate a pie chart of data to actual dollars spent on Valentine's Day candy, Halloween, Christmas, Easter, and Hanukah.
Chocolates - Students estimate volume of various candies by approximating surface area.
Have a heart - Estimate the quantity of kidney bean cans needed to build this giant heart. Volume, analysis, collaboration, estimation ...