Table of 20

How to say the table of 20

Twenty one is 20, twenty twos are 40, twenty threes are 60, twenty fours are 80, twenty fives are 100, twenty sixes are 120, twenty sevens are 140, twenty eights are 160, twenty nines are 180, twenty tens are 200.

In Hindi

बीस एकम बीस, बीस दूनी चालीस, बीस तिया साठ, बीस चौके अस्सी, बीस पंजे एक सौ, बीस छक्के एक सौ बीस, बीस सत्ते एक सौ चालीस, बीस अट्ठे एक सौ साठ, बीस नवें एक सौ अस्सी, बीस दहाई दो सौ।

This is the traditional chant used in Hindi-medium schools. The words for the multiplier (एकम, दूनी, तिया and so on) vary a little from region to region. All the pahade from 2 to 20 are on the Hindi pahade page.

A quick way to work it out

Double the number, then make it ten times as large. For 20 × 7: double 7 is 14, and ten times 14 is 140. Every answer ends in 0.

Patterns in the table of 20

• Last digit. Every answer ends in 0, because 20 is a multiple of 10. The digits in front of the zero are simply the table of 2: 2, 4, 6, 8 and 10.
• Odd and even. 20 is even, so every answer is even, whatever you multiply by.
• Digit totals. Add the digits of each answer until one digit is left. For the first nine answers you get 2, 4, 6, 8, 1, 3, 5, 7 and 9: every digit from 1 to 9, once each. This happens for every number that is not a multiple of 3.
• Steps of 20. Each answer is 20 more than the one above it. So if 20 × 7 slips your mind, take 20 × 6 = 120 and add 20 to get 140.
• Total of the first ten. Add the first ten answers and you get 1100. That is 55 × 20, because 1 + 2 + 3 and so on up to 10 is 55.

How the table of 20 is built

20 is not prime: it can be written as 2 × 10 or 4 × 5. So its table can be built from a smaller one. For example 20 × 6 is 4 × 30, and 5 × 6 = 30, so the answer is 4 × 30 = 120. The square of 20 is 20 × 20 = 400. On a multiplication chart the squares lie on the diagonal line from top left to bottom right.

Where you meet 20

A T20 cricket innings is 20 overs, so it is 20 × 6 = 120 balls. A score is an old word for 20, and 20 rupee notes are counted with this table.

Division facts from this table

Every line gives a division fact for free. From 20 × 7 = 140 you know that 140 ÷ 20 = 7 and 140 ÷ 7 = 20. To divide a number by 20, look for it in the answers above: 180 is on line 9, so 180 ÷ 20 = 9. More on this in division from tables.

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All tables: 1 to 10, 11 to 20, 21 to 30. Methods: table tricks.