Saturday, April 4, 2015

How to do addition quickly?



The trick is to add from left to right, rather than the conventional right to left. 
We can do this by adding the tens first, and then adding the ones. 

e.g. 45 + 34

Step 1: Group the numbers into tens and ones i.e. 45 (40 + 5) +34 (30 + 4)
Step 2: Add the tens i.e. 40 + 30 = 70
Step 3: Add the ones i.e.  5 + 4 = 9

Step 4: Add both your answers i.e. 70 + 9 = 79

Now to deal with carrying over numbers which are above 10.

Step 1: Group the numbers into tens and ones i.e. 46 (40 + 6) +35 (30 + 5)
Step 2: Add the tens i.e. 40 + 30 = 70
Step 3: Add the ones i.e.  6 + 5 = 11
Step 4: Add both your answers i.e. 70 + 11 = 81


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