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Opens on Chapter 19’s example: Nora’s basket of five items, and four quick estimates.
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From the book, Chapter 19. The basket rounds to $32 against an exact $32.32. 19% of $412 ≈ $80 (exact $78.28); 7/15 of $61 ≈ $30 (exact $28.47); 0.48 × 52 is about 25 (exact $24.96); $1,180 ÷ 23 ≈ $50 (exact $51.30).
Exact arithmetic: every number you type is read as an exact fraction, and rounding happens only when an answer is shown. Everything stays in your browser: no sign-up, nothing stored or sent.