Counting objects, inside and outside, patterns, longer and shorter, letter names, rhyming words and more.

Adding and subtracting, names of shapes, consonant and vowel sounds, sight words, everyday materials and more.

Place-value models, measurement, telling time, categories, nouns, verb tense, time order, living things and more.

Comparing fractions, perimeter, bar charts, regular and irregular plurals, contractions, rocks, magnets and more.

Multiplication facts, unit conversions, possessive nouns, conjunctions, using a dictionary, states of matter and more.

Dividing with remainders, area of rectangles, synonyms, antonyms, homophones, Earth's rotation and orbit and more.

Order of operations, percentages, prepositions, commonly confused words, modal verbs, adaptations and more.

Variable expressions, negative integers, Greek and Latin roots and affixes, personification, cells, body systems and more.

Solving equations, transformations, phrases and clauses, allusions, connotations, elements, compounds and more.

Linear functions, indices and roots, Pythagoras' theorem, active and passive voice, ellipses, energy transfer and more.

Quadratic functions, simultaneous equations, circles, parallel language, figures of speech and more.

Exponential functions, conditional probability, audience and tone, word patterns, colons and more.

Trigonometric functions, polynomials, claims and counterclaims, supporting evidence and more.

Logarithmic functions, vectors, derivatives, integrals, writing arguments, supporting claims and more.