Εικόνες σελίδας
PDF
Ηλεκτρ. έκδοση

EXPLANATION OF ARITHMETICAL SIGNS.

[ocr errors]

= denotes equality, as 20s. = 1 pound.

addition, as 3+5=8.

subtraction, as 97= 2. Х multiplication, as 6x4=24.

division, as 21:3=7.

proportion, as 8:10 :: 24:30. 52

the square of 5 = 25. 74 the fourth power of 7=2401.

the square root of 25 = 5. 2163

or 3/216 the cube root of 216 = 6.

...

25 or 125

ADDITION TABLE.

1 2 3 4 5 6 7 8 9

1 2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9 | 10 3

5 6 7 8 | 9 10 11 4 5 6 7 8 9 10 11 12 5 6 7 8 9 10 11 12 13 6 7 8 9 10 11 12 13 | 14 7 8 9 10

13

14 15 8 | 9 | 10 | 11 13 14 15 | 16 9 10 11 12 | 13 14 15 16 | 17 10 11 12

13 14 16 17 18

[ocr errors]

12

12

15

[blocks in formation]

2 3 4 5 6 7 8 9 10 11 12 2 4 6 8 10|12|14|16| 18 20 22 24 3 6| 912 15 18/21/24 27

30 331 36 4) 8|12|16|20|24|28|32| 36 | 401 44 48 5|10|15|20|25|30|35|40| 45 | 50 55 60 6|12|18|24|30|36|42|4854 60 66 72 7|14|21|28|35|42|49|56| 63 70 771 84 8/16 24/32 40|48|56|64| 72 80| 88 | 96 9|18|27|36|45|54|63|72| 81 | 90 | 99|108 10 20 30 40 50|60|70|80 90 100 110 120 11223344 55|66|77|88| 99110|121 132 12|24|36|48|60|72|84|96|108120132 | 144

DIVISION TABLE.

5 || Quo.

Section 1. 2 3 4 5 Qno. 2 3 4 5 1 4 6 8 | 10 2 6 | 9 | 12 | 15 | 3 8 | 12 | 16 | 20 | 4 10 | 15 | 20 | 25 || 5 12 18 24 | 30 | 6 14| 21 | 28 | 35 || 7 16 | 24 32 40 8 18 | 27 36 | 45 9 20 30 | 40 | 50 10 22 | 33 | 44 | 55 11 24 | 36 | 48 | 60 12

SECTION 2.
2 3 4
3 4 5

6|| 1! 5 7 9|11|| 2. 7 | 10 | 13 | 16

31 9 | 13 | 17 | 21 || 41 11 1621 | 26 || 51

19 | 25 | 31 || 61 15 22 | 29 | 36 || 71 17 | 25 | 33 41 19 28 | 37 | 46 | 92 21 31 41 51 101 23 | 34 | 45 | 56 || 111 25 | 37 | 49 | 61 || 122

13

9 || Quo.

13

14 25

23

Section 3. 61 7 81 8 | 9 | 10 11|| 1 14 16 18 20 22 2023 | 26 29 || 32 26 | 30 | 34 38|| 42 32 37 42 47 52 38 4450 56|| 62 43 50 | 57 64 71 49 | 57 | 65 73 81 55 | 64 | 73 82 || 91 61 171 | 81 | 91 101 67 | 78 | 89 | 100 || 111 73 | 85 | 97 | 109 || 121

SECTION 4. 10 11 12 Quo.

15 13

27 1 25 33 36

39

33 43 47 51 45 52 57 62 52 62 68 | 74 62 72 79 | 86 || 72 82 | 90 | 98 || 82 92 | 101 | 110 92 101 111 | 121 101 111 | 122 | 133 || 111 121 133 | 145

121

8

PRACTICAL ARITHMETIC. PRACTICAL ARITHMETIC teaches to calculate by numbers. Its fundamental principles are, NUMERATION, ADDITION, SUBTRACTION, MULTIPLICATION, and Division.

NUMERATION. Numeration teaches to express numbers by words and figures.

NUMERATION TABLES.

9 Units. 9 8 Tens. 9 8 7 Hundreds. 9 8 7 6 Thousands. 9 8 7 6 5 Tens of Thousands. 9 8 7 6 5 4 Hundreds of Thousands. 9 8 7 6 5 4 3 Millions. 9 8 7 6 5 4 3 2 Tens of Millions. 9 8 7 6 5 4 3 2 1 Hundreds of Millions.

Billions.

Millions.

Units.

[ocr errors]

* C., M. of Billions.
o X., M. of Billions.
o M. of Billions.
- X. of Billions.

C. of Billions.

Billions.
Q C., M. of Millions.
20 X., M. of Millions.
oo M. of Millions.
* Units.
co X. of Millions.

C. of Millions.
• Millions.

C. of Thousands.
X. of Thousands.

Thousands -M.
Q Hundreds-C.

Tens,-X.

The above number is read thus :-Four hundred and ninety thousand three hundred and

« ΠροηγούμενηΣυνέχεια »