41 results for “tip”
Multiply numerators and denominators straight across.
Divide by multiplying by the reciprocal (flip and multiply).
Two equal ratios; solve using cross multiplication.
Parentheses, Exponents, Multiply/Divide, Add/Subtract.
Gratuity as a percentage of the bill.
The multiplicative inverse of a number.
A number multiplied by itself.
A number multiplied by itself three times.
Multiplying powers with the same base adds the exponents.
Raising a power to a power multiplies the exponents.
Multiply two binomials: First, Outer, Inner, Last.
Constants factor out of a derivative.
Probability of both independent events occurring.
Multiply every entry of a matrix by a scalar.
The identity matrix leaves any matrix unchanged under multiplication.
Multiplying by the identity leaves a matrix unchanged.
Total fuel needed is the fuel-burn rate multiplied by flight time.
How much total output rises from an initial change in spending.
Total impact of spending given marginal consumption.
Gratuity based on a bill amount.
Per-person share of a bill including tip.
Least common multiple via the greatest common divisor.
A Vedic sutra for multiplying numbers close to a base (10, 100, 1000, etc.). Works by finding how far each number is from the base.
A general Vedic multiplication method that works for any two numbers. Uses vertical and crosswise multiplication patterns.
Instantly square any number ending in 5. Multiply the tens digit by (tens digit + 1), then append 25.
Instantly multiply any two-digit number by 11 by splitting and adding the digits.
Multiply by 10 and divide by 2 (or vice versa) for instant results.
Split large multiplications into simpler parts using the distributive property.
A quick way to verify multiplication and addition results by checking digit sums modulo 9.
Multiplying any number by a string of nines is instant: subtract 1 from the number for the left part, then take the complement for the right part.
When numbers are near a convenient working base that is a multiple of a power of 10, use a proportional base to simplify the multiplication.
Multiply by 10 and subtract the original number — much faster than multiplying by 9 directly.
Since 25 = 100 ÷ 4, multiply by 100 and divide by 4 for instant results.
Multiply by 10, then add half of that — because 15 = 10 + 5 and 5 is half of 10.
When one factor is even, halve it and double the other to reach an easier multiplication.
For numbers a little above 100, use the surplus from 100 to multiply almost instantly.
Multiplying by 4 is doubling twice; by 8 is doubling three times. No memorised tables needed.
Multiply two binomials by combining First, Outer, Inner, Last terms.
Two numbers equally spaced around a middle value m multiply to m² − d², using the difference of squares.
Find 10% first, then build 15% or 20% from it in your head.
Multiply miles by 1.6 for km, or divide km by 1.6 for miles. Consecutive Fibonacci numbers are handy approximations.