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Foundations · Elementary
Arithmetic
Fractions, percentages, ratios, and the mental tricks that make numbers feel friendly.
14 chapters · 56 curated · 22,726 from open sources · 382.3 billion generated
Chapters
Chapter 1Whole numbers & place value364 problems · 351.8 billion practiceChapter 2Mental math11 problems · 20.5 million practiceChapter 3Order of operations17 problems · 1.1 million practiceChapter 4Integers320 problems · 1.5 million practiceChapter 5Factors & multiples0 problems · 22.7 million practiceChapter 6Fractions861 problems · 12.2 million practiceChapter 7Decimals & percentages7,363 problems · 172.5 million practiceChapter 8Ratio & rate3,228 problems · 162.3 million practiceChapter 9Exponents & roots89 problemsChapter 10Estimation & rounding0 problems · 50.4 million practiceChapter 11Units & measurement225 problemsChapter 12Averages2,889 problems · 30 billion practiceChapter 13Money & interest893 problems · 44.9 million practiceChapter 14Arithmetic word problems6,522 problems