LESSON III.

NUMBERS FROM 10 TO 20.

How many figures do we use to express numbers ?
The number ten is written by means of figures, thus, 10.
This is one ten. How many units in one ten? Write

How many boys are snow-balling?

We write the number by means of figures, thus, 11. The right-hand figure is 1 unit. The second figure from the right is 1 ten. Eleven is one ten and one unit. How many units in ten? How many units in eleven? We will write, by means of figures, all the numbers from 10 to 20:

In these numbers, how many figures are used?

LESSON IV.

NUMBERS FROM 20 TO 30.

Two tens and 1 unit are twenty-one,
Two tens and 2 units are twenty-two,
Two tens and 3 units are twenty-three,
Two tens and 4 units are twenty-four,
Two tens and 5 units are twenty-five,
Two tens and 6 units are twenty-six,
Two tens and 7 units are twenty-seven,
Two tens and 8 units are twenty-eight,
Two tens and 9 units are twenty-nine,

21.

22.

23.

24.

25.

26.

27.

28.

29.

How many are one ten and 1? One ten and 2? One ten and 3? One ten and 4? One ten and 5? One ten and 6? One ten and 7? One ten and 8? One ten and 9? Two tens are how many? Two tens and 1? Two tens and 2? 2 tens and 3? 2 tens and 4? 2 tens and 5? 2 tens and 6? 2 tens and 7? 2 tens and 8? 2 tens and 9 ?

Write, in figures, eight, six, seventeen, nineteen, twentyone, twenty-five, twenty-six, twenty-nine.

Write as one number, 1 ten and 7, 2 tens and 3, 1 ten and 8, 2 tens and 5, 2 tens and 7, 1 ten and 4.

Read the following numbers, 22, 19, 18, 29, 27, 16, 23, 21, 11, 12, 15, 24, 28.

One ten and one unit are how many? Two tens and two units are how many? Two tens and six units? How many are one ten and six units? Two tens and six units? Write two tens and five units as one number.

Write three tens and six units; two tens and seven units; two tens and eight units; two tens and nine units.

LESSON V.

NUMBERS FROM 30 TO 100.

Three tens are thirty, 30. Four tens are forty, 40. Five tens are fifty, 50. Six tens are sixty, 60. Seven tens are seventy, 70. Eight tens are eighty, 80. Nine tens are ninety, 90. Ten tens are one-hundred, 100.

In writing tens we use two figures, and the second figure from the right tells how many tens we have written.

In writing 100 we use three figures, and the third figure from the right shows how many hundreds we have written. If we use 2 instead of 1 in the third place, we have 200, (two hundred). If we use 3, we have 300; if 4, 400, and

so on.

Write the numbers between 30 and 40:

Thus, 31, 32, 33, 34, 35, 36, 37, 38, 39.

Write the numbers between 40 and 50; between 50 and 60; between 60 and 70; between 70 and 80; between 80 and 90; between 90 and 100.

Read the following numbers, 11, 14, 29, 23, 28, 31, 40, 37, 36, 42, 45, 49, 51, 53, 57, 62, 65, 69, 70, 75, 78, 82, 90, 87, 93, 71, 98, 86, 99, 100.

Four tens and 1 are how many? 4 tens and 3 ? Five tens and 6 are how many? 5 tens and 7? Six tens and 9? 6 tens and 5? 6 tens and 8? Seven tens and 4 are how many? 7 tens and 8? 7 tens and 9?

Eight tens and 5 are how many? 8 tens and 6? 8 tens and 7?

Nine tens are how many? 9 tens and 1? 9 tens and 2? 9 tens and 3? 9 tens and 9? 9 tens and 7?

LESSON VI.

INCREASING AND DIMINISHING BY I.

how many?

1. How many eggs are two eggs and one egg? 2 and 1, are how many? ? 1 and 2, are

2. If we take one egg away from three eggs, how many eggs will be left? 2 from 3 leaves how many?

3. Three sheep and one sheep are how many sheep? 3 and 1, are how many? 1 and 3, are how many?

4. If we take 1 sheep away from 4 sheep, how many sheep will be left? 3 from 4 leaves how many?

5. Four birds and one bird are how many birds? 4 and 1 are how

many? 1 and 4 are

how many? One sheep and four sheep are how many?

6. If we take one bird from five birds, how many birds will be left? 4 from 5 leaves how many?

7. How many boys are five boys and one boy? How many are 5 and 1? 1 and 5 are how many ?

8. If we take one apple from six apples, how many apples will be left? 1 from 6 leaves how many? 5 from 6 leaves how many?

9. Six chairs and one chair are how many chairs?

10. If we take one book from seven books, how many books are left? 1 from 7 leaves how many?

LESSON VII.

INCREASING AND DIMINISHING BY 2.

1. Two apples and two apples are how many apples?

2. If we take 2 apples from 4 apples, how many apples will be left?

3. Three sheep

and two sheep are

how many sheep?

3 and 2 are how many? 2 and 3 are how many?

4. If we take 2 sheep from 5 sheep, how many sheep will be left? 2 from 5 leaves how many? 3 from 5 leaves how many?

5. How many cherries are 4 cherries and 2 cherries? 4 and 2 are how many? 2 and 4 are how many?

6. If we take 2 cherries from 6 cherries, how many cherries will be left? 2 from 6 leaves how many? 4 from 6 leaves how many?

7. How many birds are five birds and two birds? 5 and 2 are how many? 2 and 5 are how many?

8. If we take 2 birds from 7 birds, how many birds will be left? 2 from 7 leaves how many? 5 from 7 leaves how many?