TablesTables from 11 to 20 are usually learnt in classes 4 and 5. They save time in long multiplication, in finding factors and in every competitive exam with a clock running. Unlike the tables to 10, they do not have to be learnt as a hundred separate facts. Each one is a table you already know, plus ten times.
The splitting method
Take 14 × 6. Split 14 into 10 and 4. Ten sixes are 60, four sixes are 24, and together they make 84. Every line on this page can be found that way in a few seconds. With practice the two steps merge and the answer simply appears.
Shortcuts inside this group
- 11: up to × 9 the digit is written twice: 11 × 6 = 66.
- 12, 14, 16, 18: double the tables of 6, 7, 8 and 9.
- 15: ten times plus half of that: 15 × 8 = 80 + 40.
- 19: twenty times minus once: 19 × 7 = 140 − 7.
- 18: twenty times minus twice: 18 × 6 = 120 − 12.
- 20: double and add a zero.
- 13 and 17 are prime, so they have no shortcut except splitting.
How to read and print the chart
Each card is one table up to × 10. The page for each number carries the table up to × 20 with its patterns and practice questions. Press Print to get only the chart on paper. It fits one A4 sheet.
Which ones to know by heart
If time is short, learn 11, 12, 15 and 20 fully, since they come up most in daily sums with dozens, quarter hours and money. For the others, be fluent in the splitting method. The squares in this group are worth knowing too: 121, 144, 169, 196, 225, 256, 289, 324, 361 and 400.