Lesson 1 of 4Module 1 · 0% of course
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Explore › Math › Number Sense & Algebra › Number sense
Number Sense & Algebra · Number sense

Arithmetic intuition & mental math

Fast, reliable mental arithmetic: decompose numbers, use friendly anchors, the percentage swap, squares near 50, and sanity-check by estimation. Daily-useful and a trading-interview staple.

25 min · 8 steps · videoJump to quiz ↓
Mental Addition and Subtraction Tips — Math Tricks with Arthur Benjamin The Great Courses · 31 min
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Step 1 of 8 · Overview25 min read ·
Key idea
Prereqs: none, the start of Math. Next: Fractions, ratios & percentages. Arthur Benjamin's *Secrets of Mental Math*; Khan Academy arithmetic.
Next: 1. Decompose and recombine

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