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Math Doku — illustrated handwritten math-game cover

Math Doku — Free Calcudoku-Style Math Logic Puzzle

Free Math Doku puzzle: fill a 3×3 to 7×7 grid so each row and column uses every number once and every cage hits its target with +, −, × or ÷. Includes a daily puzzle, notes, hints and a guided tutorial.

Balance Algebra — illustrated handwritten math-game cover

Balance Algebra — Free Algebra Balance Scale Game: Solve for x

Free balance scale algebra game: keep the scale level by doing the same thing to both sides, get the mystery box alone, and check your answer. 30 puzzles from x + 3 = 7 to 3x − 5 = x + 7.

Dice Roller

A garden scientist organizes 12, 15, 21 and 24 in a stem-and-leaf plot.

Stem-and-Leaf Plot Maker

A square-root character and pencil detective uncover the perfect-square factor in square root of 72.

Square Root Simplifier (Simplest Radical Form, with Steps)

Hand-drawn forest islands contain the same tree species in even and uneven proportions, observed by a field biologist and a curious snail.

Biodiversity Made Simple: Richness and Evenness

Hand-drawn beetles share equal food trays at sparse and crowded densities beneath a weather cloud, illustrating competition and weather effects.

Population Regulation: How to Understand Density

Hand-drawn young sparrow listens to an adult singing while goslings follow a parent, introducing inherited tendencies and learned behavior.

How Evolution Shapes Animal Behavior and Survival

Hand-drawn deer beside a large food basket contrasts with a magnified mouse labeled per gram, comparing total and mass-specific energy use.

Metabolic Scaling: How to Compare Animal Energy Needs

Hand-drawn pea-pod characters open a gene-pool seed drawer beside purple and white pea flowers, illustrating different alleles within one species.

Genetic Variation: How to Understand Population Diversity

Comic beetles explain a pairing grid with two Aa cells, showing why heterozygote frequency under random allele pairing is 2pq.

Hardy-Weinberg Calculations: Equations and Worked Examples

Comic broccoli, cabbage and kale pose beside a wild Brassica ancestor, illustrating different forms of one species produced through generations of selective breeding.

Artificial Selection: Examples, Breeding and Trade-Offs

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