A Primary Arithmetic

Cover A Primary Arithmetic
A Primary Arithmetic
G P George Payn Quackenbos
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Now in stead of adding 1, add 2 each time : 1 7 13 19 25 31 37 3 9 15 21 27 33 39 5 11 17 23 29 35 41 and so on to 99.
In adding units, if the sum is 9, what do we do ?
Ans, We write the 9 in the units' place.
If the sum is 10, what do we do ?
Arts, 10 consists . Of units, 1 ten. 6 Hence we write in the first or units' place, _f and 1 in the second or tens' place. 1^ Whenever the sum consists of two figures, how must we place them ?
Ans, Set the right-hand figure in the units' place, the left-h
...and figure in the tens' place.
ADDITION. 35 LESSON XXXII.
Add the following numbers : — (1) (2) (3) (4) (5) (6) (7) 4 5 8 7 9 4 9 3 4 13 111 2 3 4 2 2 11 12 3 4 5 6 7 I 26 Now suppose we have to add 26 and 17.
17 Begin at the right. 7 and 6 are 13 — three 43 units and 1 ten. We w^rite 3 in the units' place, and as there are other tens we add the 1 ten in with them, making 4, w^hich we write in the tens' place. Answer, 43.
"When the sum of a column consists of two figures, which figure must we write under the column added ?


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