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Math – Adding Long Columns Of Numbers

184
  97
  15
888
162
  67
933
+45

Wait, don't grab a calculator!  Instead try the Math trick of finding tens.  First the easiest 5+5=10

  10  - Here is the ten you made
184
  97
  10  - Used to be 15
888
162
  67
933
+40  - Used to be 45

Find another 10.  8+2=10

  20  - The previous 10 plus the new 10
184
  97
  10
880 - Used to be 888
160 - Used to be 162
  67
933
+40

One more 10 is left 7+3= 10

  30  - The previous 20 plus the new 10
184
  97
  10
880
160
  60  - Used to be 67
930  - Used to be 933
+40

Now you only have to add 4+7.  That's easy, it's 11!

  10  - You carried this 10 when you added 4+7
  30 - The three 10's you found
184
  97
  10
880
160
  60
930
+40
    1

How many 100's?  90+10=100, 60+40=100, 30+10+60=100

300 - From the three 100's you found
  00 - Combined the 10 with the 90
  30
184
  07 - Combined the 90 with the 10 you carried
  00 - Combined the 10 with the 30 and the 60
880
100 - Combined the 60 with the 10 and 30
  00 - Combined the 60 with the 40
900 - Combined the 30 with the 10 and 60
+00 - Combined the 40 with the 60
    1

Now you only have to add 80+80+30.  Easy, that is 190!

100 - Carried from the 190
300 - From the three 100's you found
  00
  30
184
  07
  00
880
100
  00
900
+00
   91

Find the 1000's  100+100+800=1000 and 100+900=1000

2000 - The two 1000's you found
  000 - Combined 100 and 100 with 800
  300
    00
    30
  084 - Combined 100 and 100 with the 800
    07
    00
  080 - Combined the 800 with 100 and 100
  000 - Combined the 100 with the 900
    00
  000 - Combine the 900 with the 100
  +00
2391

Go ahead and check it with your calculator.  Now try some more of your own.

Learn to add long columns of numbers

Train your brain to deal with long columns of numbers easily.

Find The Average

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