Math topic
Arithmetic
Build reliable number skills with fractions, mixed numbers, place value, and significant figures.
Guides
Learn arithmetic
Arithmetic
Simplifying Fractions
Learn how to reduce a fraction using common factors and the greatest common divisor, with worked examples and checks.
Arithmetic
Improper Fractions and Mixed Numbers
Compare improper fractions and mixed numbers, convert between the two forms, and choose the useful form for a calculation.
Arithmetic
Adding and Subtracting Fractions
Add and subtract fractions by building a common denominator, then reduce the result with clear worked examples.
Arithmetic
Significant Figures
Learn which digits are significant, how rounding rules differ for measurements, and how to report calculated results honestly.
Practice and verify