11. If 6 times 10 are sixty (60), how many 10's in 60? 6's in 60? How many 12. If 7 times 10 are seventy (70), how many 10's in 70? How many 7's in 70? 13. If 8 times 10 are eighty (80), how many 10's in 80? How many 8's in 80? 14. If 9 times 10 are ninety (90), how many 10's in 90? How many 9's in 90? 15. If 10 times 10 are one hundred (100), how many 10's in 100? 16. How much will 2 watches cost at 10 dollars apiece? 17. If 1 desk cost 10 dollars, how much will 3 cost? 18. If watches cost 10 dollars each, how many can I get for 30 dollars? How many for 20 dollars? 19. When lard costs 10 cents a pound, how much will 4 pounds cost? 20. How much will 5 bottles of ink cost at 10 cents a bottle? 21. How many bottles of ink at 10 cents a bottle can I buy for 40 cents? How many for 50 cents? 22. How much will 6 slates cost at 10 cents each? 23. How much will 7 dozen lemons cost at 10 cents a dozen ? 24. If a dozen lemons cost 10 cents, how many dozen can I get for 70 cents? How many dozen for 60 cents? 25. How much will 8 pounds of figs cost at 10 cents a pound? 26. How much will 9 pencils cost at 10 cents apiece? 27. If pencils cost 10 cents each, how many can I get for 90 cents? How many for 80 cents? 28. How much will 10 copy-books cost at 10 cents each? 29. If melons cost 10 cents apiece, how many can I buy for 100 cents, or 1 dollar? ELEMENTARY ARITHMETIC. CHAPTER I. INTEGERS. SECTION I. NOTATION AND NUMERATION. 1. In writing numbers, ten figures are used. They are0 1 2 3 4 5 6 7 8 9 called naught, one, two, three, four, five, six, seven, eight, nine. Naught, 0, is sometimes called zero, or a cipher. The other nine figures are sometimes called digits. In writing numbers greater than nine, two or more of these figures are taken together. Repeating or naming the numbers in order is called Counting; as, one, two, three, four, five, etc. Twelve......... Thirteen............ 5 Eighteen 7 Twenty.... 8 Twenty-one.. 9 Twenty-two.. 14 Twenty-seven 27 15 Twenty-eight...... 28 16 Twenty-nine 17 Thirty.. 29 30 18 Thirty-one......... 31 19 Thirty-two......... 32 Thirty-three....... 33 21 Thirty-four. 20 22 Thirty-five.. 10 Twenty-three...... 23 Thirty-six. 11 Twenty-four....... 24 Thirty-seven.... 34 35 36 37 12 Twenty-five....... 25 Thirty-eight....... 38 13 Twenty-six........ 26 Thirty-nine..... 37 39 40 Sixty-one 61 Eighty-one....... 81 Forty-one.......... 41 Sixty-two....................... 62 Eighty-two....... 82 42 Sixty-three......... 63 Eighty-three..... 83 Forty Forty-two Forty-three. Forty-four.. Forty-six......... Forty-eight. Forty-nine.. Fifty Fifty-one. Fifty-two.... Fifty-three...... Fifty-four Forty-seven........ 47 Sixty-eight.... 64 Eighty-four...... 84 65 Eighty-five....... 85 66 Eighty-six.... 86 67 Eighty-seven.... 87 68 Eighty-eight..... 88 69 Eighty-nine. 89 70 Ninety.. 90 48 Sixty-nine..... 49 Seventy 50 Seventy-one 71 Ninety-one....... 91 51 Seventy-two....... 72 Ninety-two....... 92 52 Seventy-three...... 73 Ninety-three..... 93 53 Seventy-four.. 74 Ninety-four...... 94 54 Seventy-five....... 75 Ninety-five....... 95 Fifty-five...... 55 Seventy-six. 76 Ninety-six...... 96 Fifty-six... 56 Seventy-seven..... 77 Ninety-seven.... 97 Fifty-seven..... 57 Seventy-eight...... 78 Ninety-eight.... 98 Fifty-eight ...... 58 Seventy-nine...... 79 Ninety-nine...... 99 Fifty-nine.... 59 Eighty...... 80 One hundred..... 100 With what figure does 17 begin? 18? 35? 391 47? 46? 43? All the forties? All the sixties! All the eighties? 2. When we write numbers, ten ones are called a ten, which is written...... Two tens, or twenty, is written.... Three tens, or thirty, Four tens, or forty, One ten and one is called eleven, and is written... 11 One ten and five, or fifteen, EXERCISE. 66 ... 12 13 ... 66 14 ... 15 66 ... 16 1. Write in figures thirteen, nineteen, fourteen, twentyfour, thirty-six, forty-three, fifty-two, sixty-one, seventyseven, eighty-five, ninety-eight. 2. Write in words 12, 18, 27, 32, 86, 72, 64, 92, 26, 75. 3. Write in figures seventeen, twenty-nine, thirty, forty-eight, sixty-five, eighty-one, forty-five, seventy-eight, eighty-three. 4. Write in words 39, 96, 62, 74, 87, 34, 72, 27, 98. 5. Write in figures thirty-one, twenty-three, fifty-eight, sixty, seventy-nine, forty-four, thirty-three. 6. Write in words 22, 54, 27, 99, 23, 26, 68. 98, 77. 3. Ten tens taken together are called a hundred. 4. When numbers are expressed by figures, the first place on the right is called ones or units; the second place, tens; the third place, hundreds. Thus, 326 is three hundreds, two tens and six ones, and is read three hundred and twenty-six. EXERCISE. 1. Write in figures one hundred and twenty-five, two hundred and seventy-three, three hundred and seventytwo, four hundred and twenty-six, eight hundred and ninety-three, three hundred and ninety-eight, nine hun dred and eighty-three. 2. Write in words 126, 472, 264, 746, 827, 722, 468. 3. Write in figures eight hundred and twenty-one, three hundred and forty-three, nine hundred and seventy-four, two hundred and seventy-six, three hundred and forty-five, five hundred and forty-three, four hundred and thirtyfive. 4. Write in words 263, 348, 482, 576, 647, 446, 644. 5. Write in figures five hundred and forty-one, one hundred and fourteen, one hundred and nineteen, two hundred and one, seven hundred and twenty-three, eight hundred and four, six hundred and five. 6. Write in words 468, 144, 987, 207, 763, 875, 445. |