ADDITION 



ADDITION 



work. Here he sees the relation of arithmetic 

 to real home conditions. Getting data at 

 home for class work in school should be a 

 large part of the il home work" in arithmetic. 



THE GROCERY BILL 



Some explicit suggestions for the work in 

 addition : 



(a) Grocery order for the day, week, month ; 

 find sum. 



(b) Bills for dry goods at each buying, for 

 week, for month. 



(c) Sum of school purchases for all the chil- 

 dren of family for day, week, and so on. 



(d) Money earned by father and other mem- 

 bers of family in a day, a week, a month. 



(e) Expense of keeping pets. 



(f) Cost of milk and cream for week, or 

 period for which bill runs. 



(g) Cost of a meal. 



(h) Length of block from length of lots. 



(i) Finding number of plants in a bed by 

 adding the numbers in the various rows. 



(j) Find value of products sold by father in 

 city office or on farm, father giving sales data. 



(k) Adding distances traveled each hour or 

 day in automobile. 



(1) Keep account of sales by mother, of chick- 

 ens, eggs, butter, vegetables, turkeys, and so on, 

 mother giving data. 



(m) Counting shade trees, fruit trees, number 

 of elms, oaks, poplars, apples, cherries, peaches, 

 and seeing that the groups added make the whole 

 number counted. The data for these problems 

 is found in the home, and used either in school 

 or at home. 



(n) Add 5 to each of the following: 1, 4, 6, 

 7, 9, 8, 4, 3, 7, 2, 5, 9, 6, 8, 5. Add 8 to each. 

 Add 7 to each. Begin at left, at right, at any 

 point. Place in a column thus : 

 1 



8 + 



Add both ways 8 + 4, 4 + 8. There is much 

 variation possible in this kind of exercise for 

 ivvH'xv, slow and rapid. Draw arrow and give 

 answer without saying 8 + 1 = 9. The eye sees" 

 1, 8 as 9 ; 4, 8 as 12. Counts by 2's, 3's, etc., 

 starting at 0, 1, 3, 20, or elsewhere. 



(o) See how far the child can get in ten sec- 

 onds, thirty seconds, one minute and so on. Set 

 a series of such problems, as, "Begin with :J. 

 and add 4's, stop between 40 and 50. Begin at 

 1 and add 9's, stop between 70 and 80. See 

 how many he can get right in one minute, three 

 minutes. Do not extend the time too long. 



Further Suggestions. The exercises can be 

 varied by use of the following examples, and 

 others like them: 



(a) Give answers only. 



(b) Say 7 and 5 is 12. 

 +8 (c) Write 7+5=12. 



(d) Say 7 plus 5 equals 12. 

 Vary the way of doing it. 



7+ 



Place sum below 



6 



+7 



Place sum below 



9 



+8 



n+7=9 

 6+n=9 

 8+n=9 

 n+6=9 



71+8=9 



9=7+n 

 9=4+ 

 8=Q+n 

 8=5+n 



6 



n 



15 



(a) Say 7 and 2 is 9. 



(b) Write 7+2=9. 



(c) Say 7 plus 2 equals 9. 

 Vary the way of saying it. 



n+n=lQ 

 n+7=16 

 w+9=16 

 9+n=18 

 9+n=17 



n 



_8 

 17 



The child must erase n, and put the correct 

 digit in its place. 



3 



+5 

 8 



7 



+8 

 15 



13 

 _5 



18 



23 

 _5 



28 



33 

 _5 



38 



43 

 _5 



48 



17 27 



_8 8 



25 35 



37 

 _8 

 45 



53 

 _5 



58 



47 

 _8 

 55 



