ADDITION 



This repeated seeing of sums is most valuable 

 at all stages; it is vital in the early stages of 

 addition. 



The following groups are types of excellent 

 exercises : 



36=30+6 28+8=20+16=36 



48=40+8 46+9=40+15=55 



75=70+5 87+7=80+14=94 



19=10+9 



Then follow with this, which is excellent 

 preparation for subtraction: 

 36=20+16 75=60+15 



55=40+15 92=80+12 



94=80+14 



Add without pencil in this way: 

 24+32=50+6 68+45=100+13 



35+14=40+9 94+31=120+11 



36+23=50+9 78+84=150+12 



This is productive of the wide-awake effort 

 and excellent control and accomplishment. 



Some Methods of Addition. Civil Service 

 Method. 



3245 32=sum of units 



837 14 =sum of tens 



6248 18 =sum of hundreds 



27 9 =sum of thousands 



615 10972 



This is like the method used above for chil- 

 dren, but the zeros are not used. According 

 to that method, the sums would appear 

 32 

 140 

 1800 

 9000 

 10972 



Banker's Method. 



3245 



837 



6248 



27 



615 



32 

 17 

 19 

 10 



10972 



Here the number to be carried is added to 

 the next column but still appears in the first 

 partial sum; for example, 3 is added to 14, 

 giving 17, but still appears above 7. The 

 answer is read at sight; it is the last addition 



