Explain how to use mental math to find 620-278?

2 answers:

kramer3 years ago

5 0

What I did was add 22 in my head to 278 to equal 300.

I then just took 620-300 = 320.

Then don't forget about the 22 you added earlier because now you need to add it to the total.

320+22= 342

OR

You can add 42 to the 278 to give you 320.

Then you can easily see that its 620-320 = 300.

Then add the 42 to the 300 to give 342

xz_007 [3.2K]3 years ago

4 0

Party do 6-2,2-7,0-8

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