SECTION IV.

A. 1. 10 tens +10 tens, or 20 tens 100+ 100 = 2 hundred, called TWO HUNDRED, Written 200.

2. 20 tens dred, called THREE 3. 30 tens

dred, called FOUR 4. 40 tens

dred, called FIVE 5. 50 tens

10 tens, or 30 tens = 200 + 100 = 3 hun

HUNDRED, written 300.

10 tens, or 40 tens = 300 + 100 = 4 hunHUNDRED, written 400.

10 tens, or 50 tens = 400+ 100 = 5 hunHUNDRED, written 500.

10 tens, or 60 tens = 500 + 100 = 6 hunhundred, written 600.

dred, called six
6. 60 tens
dred, called SEVEN HUNDRED, written 700.
7. 70 tens 10 tens, or 80 tens
dred, called EIGHT HUNDRED, written 800.

10 tens, or 70 tens 600 + 100 = 7 hun

=

7001008 hun

8. 80 tens + 10 tens, or 90 tens 800 + 100 = 9 hundred, called NINE HUNDRED, written 900.

9. 90 tens 10 tens, or 100 tens = 900 + 100 dred, called ONE THOUSAND, written 1000.

=10 hun

NOTE. The third place towards the left from the decimal point is called the place of hundreds, and the fourth place that of thousands, because the figures in these places represent hundreds and thousands respectively. Thus, 1 in the third place represents 1 hundred, 5 in the third place represents 5 hundred, and 7, 7 hundred; but when in the fourth place, 1 represents 1 thousand, 5, 5 thousand, 7, 7 thousand, &c.

B. 1. What do we call 20 tens? 50 tens? 100 tens? 80 tens? 30 tens? 60 tens? 40 tens? 70 tens? 90 tens?

2. How is two hundred written by figures? Five hundred? Nine hundred? Ten hundred or one thousand? Three hundred? Seven hundred? Four hundred? Six hundred? Eight hundred?

3. How many tens in 500? in 900? in 700? in 200? in 800? in 400? in 100? in 600? in 300 ?

1 hundred, and 1 ten,

C. 1. 10 tens +1 ten, or 11 tens: called ONE HUNDRED AND TEN, written 110.

2. 10 tens 2 tens, or 12 tens = 1 hundred, and 2 tens, called ONE HUNDRED AND TWENTY, written 120. 3. 10 tens 3 tens, or 13 tens = 1 hundred, and 3 tens, called ONE HUNDRED AND THIRTY, written 130. 4. 10 tens 4 tens, or 14 tens = called ONE HUNDRED AND FORTY, written 140. 5. 10 tens 5 tens, or 15 tens 1 hundred, and 5 tens, called ONE HUNDRED AND FIFTY, written 150.

6. 10 tens

1 hundred, and 4 tens,

6 tens, or 16 tens = 1 hundred, and 6 tens,

called ONE HUNDRED AND SIXTY, written 160.

7. 10 tens 7 tens, or 17 tens == 1 hundred, and 7 tens, called ONE HUNDRED AND SEVENTY, written 170.

8. 10 tens 8 tens, or 18 tens = 1 hundred, and 8 tens, called ONE HUNDRED AND EIGHTY, written 180.

=

1 hundred, and 9 tens,

9. 10 tens 9 tens, or 19 tens called ONE HUNDRED AND NINETY, written 190.

10. 20 tens 1 ten, or 21 tens = 2 hundred, and 1 ten, called TWO HUNDRED AND TEN, written 210.

11. 20 tens 3 tens, or 23 tens 2 hundred, and 3 tens, called TWO HUNDRED AND THIRTY, written 230.

12. 30 tens 5 tens, or 35 tens — 3 hundred, and 5 tens, called THREE HUNDRED AND FIFTY, written 350.

13. 50 tens 7 tens, or 57 tens = 5 hundred, and 7 tens, called FIVE HUNDRED AND SEVENTY, written 570.

14. 60 tens 3 tens, or 63 tens = 6 hundred, and 3 tens, called SIX HUNDRED AND THIRTY, written 630.

15. 70 tens 30 tens, or 100 tens =7 hundred, and 3 hundred, called ONE THOUSAND, written 1000.

C. 1. What do we call 11 tens? 17 tens? 19 tens? 12 tens? 23 tens? 57 tens? 63 tens? 81 tens? 99 tens? 45 tens? 31 tens? 87 tens? 93 tens? 52 tens? 79 tens? 26 tens? 14 tens? 64 tens? 18 tens? 43 tens?

2. How is one hundred and ten written by figures?

3. One hundred and fifty? Three hundred and twenty? 4. Five hundred and seventy? Eight hundred and sixty?

5. Nine hundred and ten? Seven hundred and forty? 6. Nine hundred and eighty? Three hundred and ninety? 7. Four hundred and thirty? Two hundred and fifty? 8. Six hundred and ten? One hundred and twenty? 9. Seven hundred and sixty? Six hundred and ninety? 10. Three hundred and seventy?

11. How many tens in 110? in 420? in 680? in 530? in 990 in 310? in 1000? in 370? in 210? in 570 ? in 490? in 940? in 720? in 270? in 560? in 650? in 910? in 190 ?

D. 1. 9 tens +8 tens how many tens? Called what? How many then are 90+80?

2. 7 tens+6 tens= how many tens? Called what? How many then are 70 + 60 ?

3. 26 tens+8 tens how many tens? Called what? How many then are 260 + 80 ?

Read the following, supplying appropriate numbers in place of the stars.

E. 1. 17 tens

=

*tens, or *;

*tens, or *;

=*tens, or *; then 530 +60 *.

9 tens how many tens? Called what? How many then are 170-90 ?

2. 32 tens - 5 tens how many tens? Called what? How many then are 320-50 ?

3. 59 tens

7 tens

how many tens? Called what?

How many then are 590-70 ?

Read the following, supplying appropriate numbers in place

of the stars.

6 tens 34 tens, or 340; then 400-60

E. 1. 9 tens +7 tens +8 tens + 9 tens 4 tens

tens? 9070 +80+90

40 - 60?.

6 tens + 9 tens + 9 tens + 8 tens

6 tens?

180+60 +90 +90 +80

=

7 tens +4 tens + 8 tens + 3 tens 70+40 +80+30 — 90 ?

9 tens? 360 — 90 ·
4. 450607030907060-50?
5. 5080705080 +90 +70+50?
6. 209050807090+80+90 ?
7. 70+80+ 40

- 90 30+70 +60

-

- 20 + 80 ?

8. 710 80 50+80+70 - 90
22090207050802090

11. 700+60 +90-80-90+30+50

F. 1. Add as many twenties as you can to 20 without obtaining a greater sum than 200. Solution. 20+ 20 = 40, +20=60, +20=80, &c.

2. In the same manner add twenties to ten.

3. Add as many thirties as you can to 30 without obtaining a greater sum than 300.

4. In the same manner add thirties to 10; to 20.

5. Add as many forties as you can to 40 without obtaining a greater sum than 400.

6. In the same manner add forties to 10; to 30; to 20.

7. Add as many fifties as you can to 50 without obtaining a greater sum than 500.

8. In the same manner add fifties to 10; to 30; to 20; to 40. 9. Add as many sixties as you can to 60 without obtaining a greater sum than 600.

10. In the same manner add sixties to 40; to 10; to 50; to 20; to 30.

11. Add as many seventies as you can to 70 without obtaining a greater sum than 700.

12. In the same manner add seventies to 50; to 10; to 60; to 20; to 40; to 30.

13. Add as many eighties as you can to 80 without obtaining a greater sum than 800.

14. In the same manner add eighties to 50; to 30; to 70; to 10; to 60; to 20; to 40.

15. Add as many nineties as you can to 90 without obtaining a greater sum than 900.

16. In the same manner add nineties to 80; to 10; to 60; to 30; to 40; to 50; to 20; to 70.

17. Count by twenties, thirties, &c., beginning as in the above examples. Thus, 20, 40, 60, 80, 100, &c.

G. 1. Subtract as many twenties as you can from 200. Solution. 200 · -20= 180,20 160,

&c.

=

20140, &c.,

2. Subtract as many twenties as you can from 190.

3. Subtract as many thirties as you can from 300; from 180; from 190.

4. Subtract as many forties as you can from 400; from 370; from 390; from 380.

5. Subtract as many fifties as you can from 500; from 470; from 490; from 460; from 480.

6. Subtract as many sixties as you can from 600; from 550; from 580; from 590; from 570; from 560.

7. Subtract as many seventies as you can from 700; from 650; from 670; from 690; from 680; from 660; from 640.

8. Subtract as many eighties as you can from 800; from 770; from 740; from 730; from 760; from 790; from 780; from 750.

9. Subtract as many nineties as you can from 900; from 820; from 850; from 880; from 890; from 860; from 830; from 840; from 870.

Perform the above, repeating only the results. Thus, in the first example, 200, 180, 160, 140, &c.