Use the formula ALL FROM 9 AND THE LAST FROM 10 to perform instant subtractions.
- For example *1000 - 357 = 643*
We simply take each figure in 357 from 9 and the last figure from 10.
So the answer is *1000 - 357 = 643*
And thats all there is to it!
This always works for subtractions from numbers consisting of a 1 followed by noughts: 100; 1000; 10,000 etc.
- Similarly *10,000 - 1049 = 8951*
- For 1000 - 83, in which we have more zeros than figures in the numbers being subtracted, we simply suppose 83 is 083.
So *1000 - 83* becomes *1000 - 083 = 917*
