Error-free arithmetic for pupils, primary school children and advanced students includes tests for those who already know the simple tables from 1 – 10 with numbers from 1 – 20. Primary school children must master all these tables flawlessly.
For the multiplication below, the assignments can be shown in any order and a time limit can be set. Do not set it too tight straight away, as this will cause unnecessary stress.
Tip 1: Make the multiplications easier by rounding them off. E.g. 19 x 12 is 20 x 12 – 12. 2 x 12 = 24, 20 x 12 is with a 0 after it, so 240 and then subtract 12 in this case. 18 x 13 can be calculated faster by first remembering 20 x 13. That’s 2 x 13 with a 0 after it, so 260 minus 2 x 13 = 26. the result is then 260 – 26 = 234.
Tip 2: If necessary, reverse the multiplication. E.g. 13 x 19 is more difficult to calculate quickly in your head than 19 x 13, even though it is the same multiplication. 20 x 13 is close. That is 2 x 13 with a 0 after it (260). Then subtract 13 from that.