👉 Lamp math, short for "Lightning Math," is a method of mental calculation that leverages the properties of numbers, particularly powers of 2, to perform complex arithmetic operations swiftly and accurately in your head. It simplifies multiplication, division, and exponentiation by breaking down numbers into more manageable parts. For example, to multiply 13 x 47, you can think of it as (10 + 3) x (40 + 7), which expands into (10 x 40) + (10 x 7) + (3 x 40) + (3 x 7), yielding 400 + 70 + 120 + 21, resulting in 611. Similarly, for division, you can use the complementary property: a x (b - c) = a x b - a x c, making it easier to divide by subtracting multiples of the divisor. This technique relies on a deep understanding of number relationships and patterns, allowing for quick mental calculations without the need for calculators or paper.
