Table of 28

How to say the table of 28

28 one is 28, 28 twos are 56, 28 threes are 84, 28 fours are 112, 28 fives are 140, 28 sixes are 168, 28 sevens are 196, 28 eights are 224, 28 nines are 252, 28 tens are 280.

A quick way to work it out

Thirty times minus two times. For 28 × 6: 180 − 12 = 168. Or double the table of 14, or four times the table of 7.

Patterns in the table of 28

• Last digit. The last digits run 8, 6, 4, 2 and 0 and then start again, a cycle of five. All of them are even, so no answer in the table of 28 can be odd.
• Odd and even. 28 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 1, 2, 3, 4, 5, 6, 7, 8 and 9: every digit from 1 to 9, once each. This happens for every number that is not a multiple of 3.
• Steps of 28. Each answer is 28 more than the one above it. So if 28 × 7 slips your mind, take 28 × 6 = 168 and add 28 to get 196.
• Total of the first ten. Add the first ten answers and you get 1540. That is 55 × 28, because 1 + 2 + 3 and so on up to 10 is 55.

How the table of 28 is built

28 is not prime: it can be written as 2 × 14 or 4 × 7. So its table can be built from a smaller one. For example 28 × 6 is 4 × 42, and 7 × 6 = 42, so the answer is 4 × 42 = 168. The square of 28 is 28 × 28 = 784. On a multiplication chart the squares lie on the diagonal line from top left to bottom right.

Split it. Above 10, the sure method is to split the number into tens and units. 28 × 8 is 20 × 8 plus 8 × 8, which is 160 + 64 = 224.

Where you meet 28

February has 28 days in a normal year, and 4 weeks are 28 days. The 168 hours of a week can be reached as 28 × 6 as well as 24 × 7.

Division facts from this table

Every line gives a division fact for free. From 28 × 7 = 196 you know that 196 ÷ 28 = 7 and 196 ÷ 7 = 28. To divide a number by 28, look for it in the answers above: 252 is on line 9, so 252 ÷ 28 = 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.