Mental Maths Drill vs Chemistry Toolbox

Mental Maths Drill is the fastest way to sharpen your arithmetic — no pencil, no calculator, just you and the numbers. Whether you're a student preparing for exams, or someone who wants to think faster, Mental Maths Drill gives you the tools to improve at your own pace. 7 CATEGORIES Practice Addition, Subtraction, Multiplication, Division, Negative Numbers, Percentages, and Order of Operations (BODMAS). Each category is carefully designed to build real-world number sense. THREE DIFFICULTY LEVELS Start with single digits, work up to double and triple digit challenges. Every level feels meaningfully harder — not just bigger numbers, but sharper thinking required. TIMED DRILLS Race against the clock in focused sessions. All scores are normalised to answers per minute, so every session is comparable regardless of length. TRACK YOUR PROGRESS Personal bests are saved for every category and difficulty combination. Beat your record and know exactly where you're improving — and where to focus next. MISTAKE REVIEW Every wrong answer is logged. Review your mistakes at the end of each session so you learn from them, not just move past them. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Features already available: • The BEST MOLECULAR MASS CALCULATOR, by symbol or group abbreviation e.g. K4Fe(CN)6.3H2O, AcOMe... • A periodic table, with element characteristics and a dynamic comparison table • Several calculation tools for solution preparation (dilution, molar mass, molar concentration and density), and converter • Solubility table • pH color indicators • NMR (proton, carbon, constants and multiplets) • Data on common solvents (polarity, elution strength, boiling point, density...) • pKa • Buffer solutions • Organic functions (amino acids, monosaccharides, aromatic compounds, alkanes) • Standard oxidation-reduction potentials • ...