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Multiply by 5, 25, 50 and 125

From the sub-sutra Ānurūpyeṇa, Proportionately, in Bharati Krishna Tirtha's 1965 book Vedic Mathematics. Deep dive into the sub-sutra

Try it with your numbers

When to use it

Multiplying by 5, 25, 50 or 125.

The idea

5 is 10 ÷ 2, 25 is 100 ÷ 4, 50 is 100 ÷ 2 and 125 is 1000 ÷ 8. Multiply by the easy power of ten, then divide.

Worked example: 48 × 25

  1. 25 = 100 ÷ 425 is 100 ÷ 4.
  2. 480048 × 100 = 4800.
  3. 12004800 ÷ 4 = 1200.

Practice this trick

All 15 speed tricks, each with its calculator. The speed tricks use sutras from Bharati Krishna Tirtha's 1965 book Vedic Mathematics; the lessons, problems and pictures here are our own.