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.