I’ll try my way: If you have to mentally add two numbers, sometimes you can simplify and speed of the “math in your head” process by making it two “simpler” operations. It works best for time, dates, and money because there are a lot of two digit numbers involved. We’ll use 47 + 35 for our example.

“Fast” way:

47 + 35

The idea is use the first operation to make one of the numbers an EVEN number that is simpler to comprehend.

Let’s take 47 to 50 – costs us 3.

Take the three we need from the 35 and it reduces to 32.

50+32 is 82.

It’s easier to do that version math fast than it is to mentally do it by columns on paper:

“Slow” way

7+5 = 12

carry the one

4+3+1=8

means your total is 82.

Most people good at math do it the way explained and don’t realize that they do it. The second way, the hard way works best on paper. The first way works best in the mind / imagination.

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